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What to Write in a Milestone Birthday Card

A selection of milestone birthday cards on a desk

Are you wondering what to write in a special friend or family member’s milestone birthday card? Milestone birthdays are special occasions that call for extra celebrations, so whether it’s the big 30, 40, 50 or any other significant age, you want to let that person know what a big deal their birthday is…

It can sometimes be difficult to find the right words though – especially if you’re not usually particularly expressive with each other when it comes to sentiments 😁

Some Considerations When Writing Your Message

Here are some things to keep in mind when thinking about what to write in a milestone birthday card:


What’s your relationship with the birthday person? Are they a close friend, family member, coworker or acquaintance? Your message should always be appropriate to the type of relationship you have with them, as should any humour if you don’t want to get into trouble…

Age and significance

Take into account the milestone age they’re celebrating. Different ages might be associated with different emotions and connotations, with some people being excited about reaching a milestone age but others feeling more apprehensive, so tailor your message accordingly. If you know they’re especially sensitive about getting older then a joke about their age might not be the best idea, but if humour is how you both deal with these things then go for it!


Think about the emotional tone you want to convey. Do you want your message to be light-hearted, cheeky, nostalgic, heartfelt or inspiring? Consider the birthday person’s personality as well as how you usually relate to each other.

Ideas for What to Write in a Milestone Birthday Card

Shared memories

It’s always nice to mention a shared memory, experience or inside joke you have with the birthday person to make it personal – something that only you would write.

Past and future

It can also be good to talk about what they’ve achieved so far, and then focus on what they might be able to look forward to in the future.

Some examples of what to write in a milestone birthday card

  • On your 18th birthday, here are 18 reasons to celebrate…
  • I’m so proud of the person you’ve become – I can’t believe you’ve been my daughter for 21 magical years!
  • Wow, 30 today and getting better every year…
  • Congratulations on 40 fabulous years – here’s to another fun packed 40 to come!
  • Happy 50th birthday to my best friend! You’re still the same amazing person I met all those years ago. 
  • You’ve aged to perfection – 60 has never looked so good!
  • 70 today but still as young at heart as ever!
  • Happy 80th Birthday Mum – I hope I look half as good as you do when I get there!

I hope these have given you some ideas of your own. It helps to just write as though you’re chatting with them – there’s no need to be overly formal or weird about it just because it’s a milestone 😉

If you’re looking for a milestone card to send to someone awesome, take a look at the range in my shop to find the perfect card for them.