21st Birthday Cards for Friends & Best Friends

It's not every day you get to celebrate your mates, so give their 21st birthday the celebration it deserves with a card that shows how well you know them! Whether it’s packed with jokes, sentiment, or inside references, we’ve got a design that fits your friendship perfectly.

Make it even better with a personal touch (because 21 years deserves better than generic!). Add a custom message, name, or a selection of your best or worst photos, perfect for celebrating your bond and their big day all at once.

Similar Categories: Birthday Cards | Birthday Age Cards | Funny Birthday Cards | 21st Birthday Gifts