I got my first tat when I was 21 and just got my second one about a month ago, I am 37. Both of the ones I have mean something to me and they are very personal. If you don't like tatoos that's fine.
Also I want to say that tatoo artists take safety very seriously. Even when they travel and set up "tent shops" they have all of there sterilization equipment. So I'm not worried in the least about an artist using a dirty needle.