I'm 37 and never had one. I don't understand how people find them relaxing and as a pampering feature. I am too freaked out about dirty files, scissors, warm water baths, fungus, etc. and, oddly, I'm not normally a germaphobe, but for some reason pedi and mani instill the fear of germs and infection in me.
I keep my nails cleaned and trimmed on my own. I don't paint them though. A no-fuss type of girl I guess.
I'll add to it I've never had a massage or facial either. That's more of an affordability thing though.