Essential. It was a struggle I had not too long ago, as my younger cousin ‘finally’ (her words, not mine) entered adulthood — and if I'm honest, I spent weeks weighing up my options for 21st birthday gifts for her, considering everything from luxe gold jewellery gifts and personalised gifts that doubles as keepsakes, as well as prosecco and gift experiences (spa days, skydiving and afternoon tea vouchers) she was sure to prefer over a low-effort gift card. And yes, I've got you covered when it comes to 18th birthday gifts and 30th birthday gift ideas, too.