A 40th birthday feels different from the ones around it. People look back a little more, and look ahead a little more too. That's why "Happy birthday, have a great day" can feel thin in a 40th card, while a long speech about getting older can feel heavy.
This guide helps you find the middle: a message that marks the milestone, makes them smile, and sounds like you. Below you'll find a simple way to write one, then example 40th birthday wishes for friends, siblings, spouses and coworkers, funny ones that stay kind, and heartfelt ones for people who mean a lot to you.
Quick answer: what to write in a 40th birthday card
- Name the milestone. Say "40" or "your fortieth" so it's clear you know this one is special.
- Celebrate who they've become. One thing they've built, learned or done well. A family, a career change, a garden, a calmer way of dealing with life.
- Wish them something for the next chapter. Something real: more travel, more rest, the business they keep talking about.
For example: "Happy 40th, Bilal! You went from the guy who couldn't boil an egg to the one who feeds the whole family every Eid. Can't wait to see what you cook up in your forties." Light, specific and warm.
40th birthday wishes for a friend
With a close friend you can be personal and a little cheeky. Mention how long you've known each other; at 40, that number usually means something.
- "Happy 40th! Twenty years of friendship and you still haven't returned my blue jacket. I've decided it's yours. Have a great day."
- "We met when we were broke students sharing one plate of fries. Look at us now: still sharing fries, just better ones. Happy 40th, my friend."
- "Forty looks good on you, mostly because you finally learned to say no to things you hate. Proud of you. Happy birthday."
- "Happy 40th birthday to the friend who never needs a reason to call. Here's to the next forty years of voice notes that are far too long."
40th birthday wishes for a brother or sister
- "Happy 40th, big brother. You'll always be older than me, and I'll always enjoy reminding you. Love you."
- "Forty years ago Mum and Dad brought you home, and I've been sharing everything with you since. Happy birthday, sis. I wouldn't trade you, even for the bigger room."
- "Happy 40th! You were my first friend and my first enemy, and somehow you ended up being my favourite person to call."
- "Watching you raise your own kids, I finally understand all the times you looked after me. Happy 40th, and thank you."
40th birthday wishes for a husband or wife
For your spouse, mix the milestone with your life together. This is a good moment to be openly proud of them. For more on tone and length, see our guide on what to write in a birthday card.
- "Happy 40th, my love. I've known you in your twenties and your thirties, and I can't wait to see you in your forties. I'm staying for all of it."
- "Forty years of you, and I've been lucky enough to get the best part. Happy birthday."
- "You turn 40 today, and you've never looked happier or more yourself. That's the person I love most. Happy birthday."
- "Happy 40th! The kids have planned the cake, I've planned the dinner, and you just have to show up. You deserve one easy day."
40th birthday messages for a coworker or boss
Work messages should be warm but light. Mention their work or their kindness, skip anything too personal, and avoid age jokes unless you know them well.
- "Happy 40th birthday! Thank you for always being the calm person in the room when things go wrong. Enjoy your day."
- "Wishing you a very happy 40th! The team is lucky to have you, and the snacks you bring are a bonus."
- For your boss: "Happy 40th birthday! Thank you for your support and patience this year. Wishing you a wonderful celebration with your family."
- From the team: "Happy 40th from all of us! Here's to many more years of good ideas, good coffee and fewer meetings."
If they're also starting a new role around their birthday, our good luck messages guide can help with a second line.
Funny 40th birthday messages (that stay kind)
Good 40th humour laughs with the person, not at them. Jokes about small habits work. Jokes about wrinkles, grey hair, weight or "being old" usually don't, because some people feel sensitive about turning 40 even if they laugh along.
- "Happy 40th! You're now officially old enough to enjoy a nap without feeling guilty about it."
- "Forty: the age when 'going out' means a good dinner and home by ten. Honestly, it sounds perfect."
- "Welcome to your forties, where you finally have the wisdom to know what you want, and the confidence to order dessert first."
- "Happy 40th! You still dance like nobody's watching. The problem is that everybody is. Never stop."
Heartfelt 40th birthday wishes
For someone close, or someone who has had a hard road to 40, a sincere message can mean more than any joke.
- "Forty years of being the kind of person others lean on. I hope this year someone looks after you for a change. Happy birthday."
- "I know the last few years haven't been easy. Seeing you reach 40 still smiling makes me so proud to know you. Happy birthday."
- "You've taught me more about kindness than anyone I know. Happy 40th, and thank you for being you."
- "Some people get older. You get better at being yourself. Happy 40th birthday."
Milestone reflections for a 40th card
If you want to write something a bit longer, a few gentle reflections on the milestone can work well. Keep them hopeful.
- "Forty is a good place to stand: far enough to see how far you've come, and with so much still ahead."
- "Your twenties were for finding out, your thirties were for building. I hope your forties are for enjoying it."
- "Happy 40th. Here's to fewer worries about what people think, and more time for the people who matter."
What to avoid in a 40th birthday message
- "Over the hill" jokes and anything about looks, health or death. They can hurt more than you expect.
- Comparing their life to others. "At 40 you should have..." is never a wish.
- Copied poems. One personal line beats a long forwarded verse.
- Inside jokes in a work card. Save those for a private message.
Send a 40th birthday card with photos
A photo card is a nice way to mark a 40th, especially with an old photo next to a recent one. The free birthday card maker works like this:
- Add up to three photos (optional). A "then and now" pair works well for a 40th.
- Under "Templates For This Occasion", pick a birthday design. Navy Bunting, with party bunting and fairy lights, has a celebration feel; Balloon Blush is softer and brighter.
- Type their name, your name and your message, up to 500 characters. Add up to 12 animated stickers if you like.
- Under "Link Expiry", choose 7 or 14 days. The card is deleted automatically after expiry (7 or 14 days).
- Tap "Get My Link" and share it on WhatsApp, Telegram, Facebook, X or Email, or copy the link.
It's free and needs no signup. They open the card in their browser, with no app to install.
Frequently asked questions
What do you write in a 40th birthday card?
Mention the milestone, say one specific thing you admire about them, and wish them something real for the years ahead. Two or three sentences is enough.
What is a funny but kind 40th birthday message?
"Happy 40th! You're now officially old enough to enjoy a nap without feeling guilty about it." Joke about habits, not looks or age itself.
What should I write for a friend turning 40?
Mention how long you've known each other and one shared memory, then wish them a great next chapter.
How do I wish a coworker a happy 40th?
Keep it warm and simple: thank them for something they do at work and wish them a lovely celebration. Skip age jokes unless you know them well.
Is it okay to mention their age in the card?
Yes. Most people like the milestone being noticed. Just keep the tone proud and positive rather than teasing about getting old.
Final takeaway
A great 40th birthday wish doesn't need to be clever or long. Say "40" with warmth, mention one real thing about who they are, and wish them a next chapter they'll enjoy. Keep the jokes kind, and the message will be remembered for the right reasons.