That's weird. I'm 45 and dreamt last night I bought a playsuit, and it was a disturbing dream. Make of that what you will.
I reckon you're a size 8, with good legs, and that is the important issue, not your age. I also suspect one of the issues with the playsuit is the whole thing about having to effectually disrobe when visiting the lavatory: that is what marks its position over the boundary between youth and age. Simply because age often brings a touch of pragmatism, even cynicism, along with experience - in love, life, and wardrobe.
In youth, one is trying things out for the first time: "Shall I give this boy a second chance, even though he has been drunk on every date we've been on?" Youth says: "OK." Age says: "Been there, done that. No."
And so to the playsuit: Youth says: "Yo! A playsuit . That's fun! Who cares if I have to take the whole thing off if I want to pee! It can't be that much hassle!" Age says: "Oh God. Life's too hard anyway. And ... ew ... I remember that time when I was 17 and was so drunk my friend had to do my trousers up for me. Eeek."
So, it sounds as though you've made a judgment call, drawn on your accumulated experience, and decided you can handle it - even the slightly eewk-inducing name. I reckon it'll be fine, and you'll look good.