The people who don't regret their tattoos are the people who know themselves well enough to know what to get.... I could be polite and add "IMO" But lets face it I'm right
I am 28 and have 2 tattoos for now, nobody else I hang out with has any ink done, so I doubt its common among people in general.
I always knew I was going to get inked, decided at age 4, and when I was 15, I was itching to get 1 but I promised myself I would wait until I was absolutely sure of what I wanted, and by the time I had it done, well I knew myself well enough to know there'd never be any regrets
3 more on the horizen for me, but I still need to design the 3rd, inspiration hasn't hit yet