40th Birthday Wishes: What to Write in a 40th Birthday Card

September 6, 2026

Not sure what to write in a 40th birthday card? Keep it short: "Happy 40th! Fabulous, forty and still the life of the party." There are more ideas below for friends, family and colleagues.

You're in the right place for 40th birthday card messages and wishes. There are 25 ready-to-copy lines on this page, grouped into funny 40th birthday wishes, heartfelt 40th birthday messages and short 40th birthday card messages, plus more below - pick one, change a detail so it sounds like you, and you're done.

Forty is the birthday with the best jokes, because by now most people can take them. It's also the birthday where a bit of sincerity goes a long way, especially for anyone juggling work, kids and ageing parents at the same time.

Below you'll find 40th birthday wishes grouped by tone: funny, rude, heartfelt and short. Use one as written or as a first line, then add something only you would say.

For a milestone this size, it's worth writing the message somewhere else first. A card you've thought about for two minutes reads completely differently from one written on the doorstep.

What to write in a friend's 40th birthday card

These warm, affectionate messages are perfect for close friends who have walked alongside you through life's ups and downs. Use them when you want to celebrate your shared history and bring a smile to their face on their special day. For a lovely personal touch, pair one of these wishes with a quick mention of your favourite memory together from the past decade.

Happy 40th to my partner in crime. Same time next decade?
Forty and fabulous - I'd expect nothing less from you.
Happy 40th! You don't look a day over thirty-nine.
Here's to forty years of you and twenty of putting up with me.

40th birthday messages for a daughter or son

These loving sentiments are tailored for parents celebrating their child reaching this significant milestone. They are ideal for placing inside a keepsake card that they can treasure for years to come. To make your message even more meaningful, try adding a brief sentence about how proud you are of the wonderful adult they have grown to become.

Happy 40th to the best thing I ever did. So proud of you.
Forty years since you changed my life. Happy birthday, love.
I still remember holding you for the first time. Happy 40th.

Short 40th birthday wishes

These punchy greetings suit acquaintances, neighbours, or anyone who prefers a straightforward message. They are ideal when you have a smaller card or are signing a group card at work. A helpful tip is to write your message in a neat, bold print so that the simple words stand out beautifully on the page.

Happy 40th - here's to the best decade yet.
Forty, fun and fabulous.
Cheers to forty years of you.
Life begins at forty. Enjoy every bit.

Funny 40th birthday wishes

Perfect for close friends, siblings, and relatives who do not take themselves too seriously, these witty lines are ideal for lightening the mood. Use them to bring some laughter to the celebrations and ease any anxiety about turning forty. As a tip, make sure the recipient appreciates a bit of gentle teasing before you put pen to paper.

Happy 40th. You're not over the hill, you've simply found a nice bench near the top.
40 today. Your idea of a wild night now involves a bath and a documentary.
Congratulations on 40 years. You've officially started reading the back of the vitamin bottle.
Happy birthday. At 40 you know all the words to songs nobody plays any more.
You're 40, which means you can complain about your knees with full authority.
Forty years old and still pretending you can carry the shopping in one trip. Happy birthday.
Happy 40th. The good news is you've earned your opinions. The bad news is everyone's heard them.
You've reached the age where a good chair is a genuine event. Enjoy your 40th.

Heartfelt 40th birthday messages

These sincere sentiments suit beloved family members, partners, or very dear friends who deserve some extra appreciation. Use them when you want to offer genuine encouragement as they enter this exciting new chapter of life. A useful tip is to draft your chosen message on scrap paper first to ensure your handwriting looks perfectly neat inside the card.

Forty years of being someone people rely on. Happy birthday.
You've built a good life and you've done it your way. Enjoy your 40th.
Happy 40th to the person who holds everything together and never mentions it.
Here's to forty years, and to a decade with a bit more time in it for you.
You're kinder at 40 than most people manage in a lifetime. Happy birthday.
Whatever the next ten years bring, you'll make it look easy. Happy 40th.
Wishing you a birthday as good as you've been to everyone else.

Short 40th birthday card messages

Designed for busy colleagues, casual acquaintances, or anyone who values brevity, these sweet lines are perfect for quick signatures. Use them when you want to deliver a cheerful greeting without filling the entire page. For a simple way to elevate your message, write it in a colourful pen that matches the design on the front of the card.

Happy 40th. Still the best one here.
Forty and fabulous, obviously.
Here's to the big four oh.
40 years, no regrets. Have a great day.
New decade, same brilliant you.

Rude and cheeky 40th birthday messages

These playful, cheeky options are best reserved for your closest friends, siblings, or partners who thrive on banter. Use them to poke good-natured fun at the realities of getting older on their big day. To keep things sweet, a clever tip is to follow up your cheeky joke with a quick promise to buy them a birthday drink.

You're 40. That's half your warranty gone.
Happy 40th, you absolute fossil.
Forty years old and still can't be trusted with a karaoke machine.
Congratulations, you're now old enough to be genuinely annoying about house prices.
Happy 40th. You look great, considering.

How to write it so it lands

Draft the message on your phone first, then copy it neatly.
If the card is going in a group, write the sincere line rather than the joke, someone else will do the joke.
Mention the party, the meal or whatever's planned. It dates the card nicely.

Frequently asked questions

What do you write in a 40th birthday card?

A joke about the decade, then something genuine about them. "Forty years of being someone people rely on, happy birthday" works for family, friends and colleagues alike.

What are good funny 40th birthday quotes?

Keep them short and about the decade rather than their looks. Lines about knees, early nights and strong opinions land well because most 40 year olds say them first.

What should you not write in a 40th birthday card?

Avoid anything about being past it, running out of time, or comparing them to someone else their age. Gentle ageing jokes are fine, but the card should still feel like a celebration.

What is a good example of 40th birthday card messages and wishes?

"Happy 40th. You're not over the hill, you've simply found a nice bench near the top." is one of 25 examples on this page. Pick the one closest to the tone you want, then add a specific detail of your own - a shared memory, a date, a name - so it reads as yours rather than copied.

What do you write on a 40th birthday cake?

Keep it short: "Happy 40th [name]", "Forty and fabulous" or "Life begins at 40".

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