Who cares if others think it's a midlife crisis, do what makes you happy. I'm nearing 40 and still get a couple tattoos a year. I love the feeling of a new tattoo, it boosts my confidence and gives me a sense of accomplishment for sitting through the fairly painful process.
Exactly. Part of the fun of tattoos is everyone thinking you look stupid and being able to practice the stoicism of not caring what other people think and focusing on the intrinsic joy of doing what you want.