LETTERS · TO YOUR CHILDREN

A time capsule letter to your child, to open at 10, 13, 16 or 18

A time capsule letter to a child is written now and opened years later, when they are old enough to want it. Below are examples for ages 10, 13, 16 and 18, what each age might want to hear, and how to seal letters to your child for the right day.

Start a letter to your child

Open when you turn 10Write →Open when you turn 13Write →Open when you turn 16Write →Open when you turn 18Write →Open when you move outWrite →Open when you have a hard dayWrite →

Each one opens a blank letter with the moment already on the envelope. No account needed.

An example to start from

To Sam, to open on your 10th birthday

Sam,

You are six and you ask me one question about volcanoes every night at bedtime. I do not know the answers. I just say 'wow' and you believe I know things. Please keep this between us.

By the time you open this you will be ten and you will know more than I do. Right now your front tooth is gone, you whistle through the gap, and you ask for one more minute when you mean ten. I give you the ten.

Happy double digits.

Dad

AN EXAMPLE TO BORROW FROM
MAKE IT YOURS

How your letter stays yours

Private by default. Only the person you address can open it.

Delete any time: before it's opened, after, or everything.

Nothing is public unless you ask, and a person reads it first.

How privacy works

A child's crayon drawing of their family on a wooden floor — Photo: olia danilevich on Pexels

What to put in a time capsule letter to your child

Start with a snapshot of now. How tall they are against the door frame. Their best friend's name. What they say wrong that you secretly love. The show they watch on repeat. These are the details a child forgets first, and the ones they may want back most.

Then say what you see in them, what you hope for, and one thing you want them to do on the day they read it. Close with a question they can answer in their own time.

EXAMPLE LETTERS

Letters to borrow from

We wrote these to show what a letter like this can sound like. Borrow a line, then make it yours: the small, true details are what make it land.

To Priya, to open on your 13th birthday

Priya,

You are ten and you still hold my hand in the parking lot. I know that is about to stop. I am writing this so that when you are thirteen and I embarrass you by breathing, you have one page that says it plainly.

I am on your side. When you roll your eyes, I still am. If you need to be alone in your room, that is fine. If you want me to sit on the floor outside the door, I will.

You do not have to like me this year. Just know where I am.

Mom

AN EXAMPLE TO BORROW FROM
MAKE IT YOURS

To Marcus, to open on your 16th birthday

Marcus,

I have been in your life for two years. You are twelve, and you have let me teach you exactly one thing, which is how to grill a burger. I am counting it as a win.

I did not try to be your father. I tried to be a decent guy at the dinner table. By sixteen you will have decided what you think of me, and that is allowed.

I am glad I got to know you. Take the car keys seriously. Take yourself a little less seriously.

Your stepdad

AN EXAMPLE TO BORROW FROM
MAKE IT YOURS

To Hana, to open when you turn 18

Hana,

We are writing this at the kitchen table while you do homework in the next room and pretend you are not listening. You are eight. You have decided you will be a marine biologist, or possibly a baker who studies sharks.

By the time you read this you will be a legal adult who rolls their eyes at us for treating you like a kid. We will try to stop. We probably will not.

Whatever you picked, we are proud of you. Call home. Bring laundry.

Mom and Dad

AN EXAMPLE TO BORROW FROM
MAKE IT YOURS

To Jada, for the day you move out

Jada,

It was just the two of us for a long time, so I know the apartment will be very quiet the day you leave.

You are fourteen now and last week you ate the whole birthday cake and blamed the dog. I have forgiven you. When you move out, take the good pan. Learn to make one dish you like. Call on Sundays if you can, and on other days if you cannot.

You made me braver than I was. That is all.

Mom

AN EXAMPLE TO BORROW FROM
MAKE IT YOURS

To Mateo, for a hard day at any age

Mateo,

If you are reading this, something has gone sideways. I do not know what. A test, a friend, a thing you said and wish you had not. I have done all of them.

Sit down. Drink some water. This is not the whole story of you.

I wrote this on a good day, when you were seven and decided to wear your cape to the dentist. You were brave in the chair. I remember that you were brave and also scared, and that those are not opposites.

Dad

AN EXAMPLE TO BORROW FROM
MAKE IT YOURS

Letters to your child at 10, 13, 16 and 18

Each age has its own register. These are starting points, not rules.

At 10: keep it light and full of memories. They still like hearing how small they once were.
At 13: keep it short. Say you are on their side and you do not need them to be anyone else.
At 16: respect that they are nearly grown. Admit one thing you got wrong and name one thing you trust them with.
At 18: say what you are proud of, and that home is still home. Skip the lecture. They have heard it.

How to seal letters to your child

Write each letter as Open when you turn 10, 13, 16 or 18, and set each one to unlock on that birthday, so none can be opened early. Each one stays locked until its date.

A child has no email yet, so the simplest route is to keep the letter for now and give them the private link or QR code yourself on the day. Pick a wax seal color and a handwriting style. You can unseal and edit a letter until it is opened. Download your own copy of each one, and keep those copies somewhere safe.

A paper capsule, or a sealed letter, or both

If your family is burying a box or sealing one in a closet, a handwritten page inside it is lovely. A sealed letter written here can wait for a different, later day. You can do both. For a box, see time capsule letters for family and classroom ideas.

IF YOU ARE STUCK

Questions that help you start

What is your child doing right now that you want to remember?
What does your child ask for at bedtime?
What does your child believe about the world that you hope stays true?
What did you know at their age that they will not need to learn?
What do you worry about, and what do you want them to hear instead?
What do you want them to do on the day they open it?
What are they scared of right now?
What is a family joke nobody outside your house would understand?

Open When never writes your letter for you. These are only here to get the first line down.

QUESTIONS

Questions people ask

What do you write in a time capsule letter to a child?

Write a snapshot of who they are now, what you see in them, and what you hope for. Add small details like their height, their best friend and what they say wrong. End with one thing you want them to do when they open it.

What age should a child open a time capsule letter?

There is no right age. Good moments are 10, 13, 16, 18 and the day they leave home. Choose by what you want to say. A light letter suits 10. A letter that says you are on their side suits 13.

Should I write one letter or a letter every year?

Either works. One letter is easy to finish. A letter every year, sealed for different moments, gives your child a series they can read in order. Start with one letter now and add more whenever you have something new to say.

Can I write letters to more than one child?

Yes, one letter each. Siblings should not share one, because each child needs words that are about them. You can make the structure match, such as a snapshot, a hope and a question, so that none of them feels less loved.

How does my child get the letter?

Leave their email and they receive a message that a sealed letter is waiting, with no words in it. Or keep the letter for now and give them the private link or QR code yourself. An email is optional and no account is needed.

KEEP READING

More letters like this

Letters to my baby, to read when they are olderRead →A letter to my daughter: examples from a mom or a dadRead →A letter to my son: examples from a dad or a momRead →A time capsule letter, for the day it is openedRead →Open when ideas: moments to seal a letter for, and what to writeRead →