The anniversary gifts parents actually keep do one of two things. They earn a place in their ordinary week, or they hold a piece of the family's story that nobody but their children could give. Gifts that qualify include their wedding film rescued from an old tape, their wedding album captioned in their own words, a letter from each child, a recording of them telling how they met and a dinner the family cooks for them. Before you buy anything, ask where it will be in a year and whether anyone else could have given it.

How do you choose an anniversary gift your parents will actually keep?

Choose an anniversary gift for your parents that passes at least one of two questions. Will it have a place in their ordinary week a year from now? Could anyone but their children have given it? An everyday upgrade passes the first, a family-story gift passes the second, and the best gifts pass both: a photo book of their wedding, captioned in their own words, sits on the coffee table and could only have come from you.

A gift that misses can stay in your parents' house for years, because people clear out fewer belongings as they age. Using US survey data from 2010, Ekerdt and Baker (2014) found that the older people were past 50, the less likely they were to clear out belongings. After 70, about 30% had done nothing in the past year to clean out, give away or donate things, and over 80% had sold nothing. The authors note that a growing collection can become a worry for its owners and for others. That is a reason to choose something your parents will use, or something they will be glad to keep on display.

What parents value may also shift with age. Socioemotional selectivity theory, set out by Stanford psychologist Laura Carstensen and colleagues (1999), holds that when people see their time as limited, which tends to come with age, emotional goals take priority over gathering new information. It is a theory about social goals rather than a study of gifts. We read it as pointing toward gifts about family and time together. For the wider research on what recipients value, see our guide to what makes a good gift.

What are the best anniversary gifts for parents who have everything?

The best anniversary gifts for parents who have everything use what only their children have: access to the family's photos, tapes and stories, and the time to do something with them. The first five ideas below hold the family story. The last three suit parents who would rather use a gift than keep one.

Their wedding film, rescued from an old tape

If your parents' wedding was filmed, getting the recording onto a digital file may be the most valuable gift on this list. Wedding videos from past decades often sit in a box on tapes the family no longer has a machine to play.

Videotape doesn't keep the way prints do. In a 1996 statement to the Library of Congress, John Van Bogart, a media-stability researcher at the National Media Laboratory, wrote that film and paper can last centuries with proper care. Most videotapes, by his account, last only a few decades. A recording can also become unreachable when no working player for its format can be found. He gave no single lifespan, because it depends on the tape and how it was stored. That uncertainty is a reason to copy any old tape now.

Ask your parents, or the relative who keeps the family boxes, where the tape is. Photo shops and transfer services convert tapes and old film reels to digital files. Ask for a file you can copy, so every sibling gets one. Then watch it together on the biggest screen in the house.

Their wedding album, scanned and captioned in their own words

A wedding album captioned in your parents' own words turns photos they already own into something new. Sit with them for an afternoon and go through the wedding album and the early years page by page. Ask about each photo: who is that, where was this, what happened that day. Write their answers down as close to their words as you can, then put the captions beside the scans in a printed photo book or a shared folder for the family.

The afternoon of telling is part of the gift, and the captions keep names the next generation would otherwise lose. Our guide to turning old photos into a video gift covers scanning prints at the right resolution and handling fragile albums.

A letter from each of their children

A letter from each child costs almost nothing and is the kind of anniversary gift that gets reread. Each of you writes about a moment from your parents' marriage that you saw growing up, something it taught you, and something you are grateful for. Put the letters in one folder or bind them together, and let grandchildren add a drawing or a few lines.

Writers tend to worry more than they need to. In experiments by Kumar and Epley (2018), people who wrote gratitude letters underestimated how surprised and how positive their recipients would feel, and overestimated how awkward the recipients would find it. The letters went to anyone who had mattered to the writer, not specifically to parents. Even so, we think the lesson carries over to parents, and most of the awkwardness you expect is yours.

A recording of your parents telling how they met

A recording of your parents telling how they met gives the family their voices as well as the story. Set a phone on the table, ask one question at a time and let them interrupt and correct each other. The nonprofit StoryCorps publishes a free list of great questions for these conversations, with sections for parents and for marriages: how they met, how they knew, the best and hardest times, and the advice they would give a young couple.

Share copies with your siblings and keep one with the scanned photos, so grandchildren can one day hear the story in their grandparents' own voices.

A dinner the whole family cooks for them

A dinner the family cooks and hosts puts everyone at one table without asking your parents to do the work. It is also an old tradition. In her 1922 book Etiquette, Emily Post wrote that a golden wedding was most usually celebrated with a large family dinner to which all the children and grandchildren were invited.

Cook the menu from their wedding or the dish one of them always made, seat them at the head of the table, and give each person a minute to share a memory. If the family lives far apart, set a time for a video call that evening and ask everyone to bring one story or one photo.

Their wedding photo, recreated

Recreating their wedding photo gives your parents a then-and-now pair to frame side by side. Find the best-known photo from the wedding and match the pose, the setting and, if they are game, a detail from the outfits. Take the new photo on or near the anniversary.

Illustrative example: a couple who married on the steps of their town hall forty years ago stands on the same steps again, in the same pose, while a grandchild takes the photo. The two prints go into one double frame.

An upgrade to something they both use every day

An upgrade works as an anniversary gift for parents when it is something they use together every day. Think of the bench where they drink their morning coffee, the two chairs on the porch, the kettle, the bedding or the reading lamps on either side of the bed. Replace the worn version with the good one they have looked at and decided they could live without.

Choose something for both of them. A present that suits only one parent turns the anniversary into a gift for one of them.

A trip or experience you plan from start to finish

An experience suits parents who would rather do something than own something, as long as you take the planning off their hands. Book a return to the town where they married or the place they honeymooned, a concert by the band they danced to, or a weekend somewhere they have talked about for years. Arrange the transport, the bookings and whoever feeds the cat, and hand them a folder with everything inside.

Plan around comfort as well as the destination: fewer early starts, a hotel with a lift, a car instead of three changes of train.

Which anniversary gifts for parents usually end up in a drawer?

The anniversary gifts that end up in a drawer usually fail both questions: they have no place in your parents' week, and nothing about them could only have come from their children. Four kinds are common.

• Decor with names and a date. Engraved plaques, photo crystals and signs with the wedding year fill many anniversary gift lists. They suit parents who already display things like this. If their walls hold family photos and little else, give them better photos instead.
• Gadgets that need setting up. A digital frame or smart speaker that needs an app, an account and the Wi-Fi password often stays in its box. If you give one, set it up first and load it with the family's photos.
• A gift for one of them. A golf voucher or a cookbook marks a birthday. An anniversary gift should belong to both.
• More of what they already have. Another set of glasses, another throw for a sofa that has three.

Most of these can be saved by adding something only you can give: the digital frame loaded with their scanned wedding photos, or the engraved serving board handed over with a card about the family meals it stands for.

What should you give your parents for their 25th, 40th or 50th anniversary?

For a milestone anniversary, give your parents a gift about the whole marriage and pair it with a gathering. The traditional materials give each milestone a theme, such as silver for the 25th, ruby for the 40th and gold for the 50th. A theme works best as the wrapping for something personal: their rescued wedding film presented in a silver box, or the letters from each child tied with a gold ribbon.

Milestones grow rarer the further they go. According to US Census Bureau data, 35% of currently married couples in 2009 had reached their 25th anniversary, and 6% had passed their 50th. Emily Post called the golden wedding "a quite sacred event". A 50th or 60th deserves the whole family gathered around it.

The materials below follow one common list, Hallmark's. Lists vary by source, and the ideas in the third column are suggestions.

Our guide to romantic anniversary gifts lists the traditional materials from the first year onward, with an idea for each.

Should a 50th anniversary party for your parents be a surprise?

A 50th anniversary party for your parents is usually better planned with them than sprung on them. Ask one parent quietly, or both openly, whether they want a party, a dinner or a quiet day, and who should be there. Keep the surprises for inside the event: the rescued wedding film, a guest who was at the wedding, or a table of letters and photos from the people in the room.

How do siblings split an anniversary gift for their parents?

Siblings get the best result by giving one gift together, with one person in charge. Agree on the gift and a budget early, name an organizer, and set a date by which everyone pays their share and sends their part. Shares don't have to be equal, because a sibling with less money can take on more of the work, such as finding the wedding tape, interviewing your parents or cooking the dinner.

Give every sibling a part that carries their name. A folder of letters works well for this, because the cost is shared while each letter is personal. A sibling who lives abroad can write a letter or record their questions for the interview, both of which travel easily.

What do you give parents who say they don't want anything for their anniversary?

When parents say they want nothing for their anniversary, take them at their word about objects and give something that takes no space: a letter, a recording, a meal or a day of your time. Read "no gifts" as no more things and no fuss, unless they tell you otherwise.

A donation to a cause they already support can suit parents who give to charity themselves. Say in a card which cause you chose and why. Skip the surprise party if they have asked for a quiet day. For many couples, dinner with their children and a card that says something real is the anniversary they wanted.

Is there a video gift for your parents' anniversary?

For the anniversary itself, the best video gift is one you make from their photos, or their own wedding film rescued from tape. A slideshow set to their wedding song, with photos from the wedding, the early years and the family that followed, can carry the whole marriage in a few minutes. Our guide to turning old photos into a video gift covers choosing, scanning and ordering the photos, the music and the length.

yume doesn't make an anniversary film, but its photo film suits a parent's birthday. In yume's The Museum of Us, six family photos hang in their own frames in a private museum, in the order you choose, so an old family photo can hang beside one from last summer. Nothing is cropped and no faces are altered. A song composed just for your film plays as the camera walks past them. The film ends with a newly made scene of you, created from 1 to 4 clear photos of you, raising a glass to your mom or dad on a terrace under golden fireworks. The closing card then reads "Happy birthday" and your parent's name, then your own message or a default wish, then your name. You upload the photos and a few details and do no editing yourself. The film runs just under a minute, is in English, costs €19, includes one free edit and usually arrives by email about 15 minutes after you submit the details.

Check three details before you choose it. The closing card always says "Happy birthday", so it is a birthday gift rather than an anniversary one. It is made for one person, not a couple. And one giver appears in the toast, so a gift from several siblings still shows one face on the terrace. To judge the style before a parent's next birthday, watch the example films on The Museum of Us page; they were made for fictional people.