Son 21st Birthday Cards

Discover great value 21st birthday cards for sons

Help your son celebrate a very special milestone with an equally special card. Here, you’ll find birthday cards from just 99p, with modern, traditional, funny and sentimental designs available to perfectly suit your relationship and his personality. Find a 21st birthday card your son is sure to cherish.

Customise a card for his 21st birthday with ease

Mark his 21st in your own way with a unique personalised birthday card. Here, you can create a 21st birthday card for your son from £1.79. You can add his name, his age, special messages and so much more to make them truly special, just like he is.

Did you know we also have a wide range of photo cards to choose from? Make a fun photo card for your son by adding snaps of him from when he was a baby, or other special photos you know will mean a lot to him on his 21st birthday.

Don’t forget your son’s 21st birthday gift

Browse our son birthday gifts and find something that’s perfect for his 21st. Online, we offer a wide range of keepsakes, pint glasses and other classic milestone age gifts, as well as a selection of attention-grabbing Happy 21st birthday balloons you can have delivered to his door.