39-year-old F here. I got one tattoo on my 35th birthday, with two of my friends. I'd always wanted one and had never gotten around to it. It's on the top of my right butt cheek. I'm thinking about getting another one for my 40th birthday, at the top of my left butt cheek. Good place for it, because the fat made it hurt less and nobody has to see it unless I show them. (i'm in a conservative field.) I just love mine. No regrets whatsoever. My 3-year-old daughter thinks it's awesome. I'm conservative in dress, hair and makeup - the tattoo is kind of a symbol that secretly, I'm a nonconformist and a bit of a badass.
