I have 2. Both black, both designed by me.
I am almost 43, had them done when I was 36.
Make of me what you will ..... I was definitely in the nerdy, goody two-shoes, wouldn't say boo to a goose, more or less straight A group at school. Would almost certainly be in an adult-equivalent group now ..... I don't drink, don't smoke, am pretty anti-social, read heaps, don't holiday with "the masses" if I can help it, am now a size 10(up) and 8 (down) therefore not overweight, am kind to animals, love gardening, walks in the country ....... and well, you get the picture, I'm not in the stereotypical groups described in this thread.
I got them because I wanted them .... have no deep-rooted psychological idea why I wanted them, above and beyond the fact I like the look of mine - haven't bothered to stop and analyse it .... understand they're there for life and one day my skin will be less firm than it is now blah di blah.
Suppose it is becoming part of British culture in so far that they are more common and have less "shock" factor than 20 years ago when, supposedly only "rough" types and sailors were popularly "allowed" to wear tattoos. Despite having my own, I think some others look appalling - either because they have been poorly executed, or because I don't like the subject matter, or because I'm not an admirer of that particular style ..... in the same way everyone has different tastes and a different idea of what constitutes style. However, that's a completely subjective view and other people's choices don't "bother" me one bit ..... even if I personally think a tattoo naff or ugly, it will have been chosen to mean something to its wearer.
Off on a slight tangent - I find it slightly bemusing that people hold such strong views on tattoos .... maybe it's the left over connotations from the time when ex-cons etc were most likely to sport them ? I'm not having a go ...... but have seen the "what's the attraction of tattoos ?" question crop up over and over again, both on Mumsnet, other forums and also as a topic of conversation. I simply wonder why this is when quite obviously, no-one is forced to have one, yet they often arouse such strong vierws ? To me (anyway) it's the same as if the attraction of - say - off the top of my head - false nails - were as hotly and as frequently debated. I could be wrong but I have a tiny sneaking suspicion that people often have a macabre fascination for tattoos despite not wanting or liking them themselves.