I'm almost 40. It used to be visible tattoos and piercings meant you were unemployable in most "mainstream" jobs. Same with odd colored hair or other unconventional appearance. I remember the "rule of thumb" was it was ok to get tattoos on your sleeves because you could always cover them up for work.
Tattoos are mainstream now so not so they are much more accepted at the workplace now. I remember I was really surprised the first time I saw someone with a facial piercing working a customer service job, it was at CVS.