You're not alone. I am older as well - with a family. It's difficult, because now I have to work much harder to hide it. No way in hell are my kids ever going to see this.
I self-injured from a very young age, but didn't actually start cutting until my early 20's. It was severe for years, until I had kids. Since then, I've gone an average of 3 years in between lapses? So it's much easier to avoid for me - I have more reason to stop - but it hasn't truly gone away.
Anyway... I wanted to let you know that you are not alone. One is never to old to suffer pain, or to look for ways to feel better - even if only temporarily.