I'm not really sure onesies are not universally worn by all ages. You're born and clad in a onesie from infancy through toddler-hood but onesie wearing abruptly drops off after that. Onesies are cozy and reassuring like a hug from Gam Gam. They're adorable and tasteful as well. There's truly no reason to stop wearing them. That's why we've created this retro onesie for your adult-bodily enjoyment. Go ahead, pretend to be an infant again. You're not gonna be disappointed.