Impaction Does Impaction always occur?

I was reading a thread on here, and the term "impaction" was mentioned. I looked it up. That was new to me. I've had a few guinea pigs before, but they had all been female. I have a female now, but was going to get her a friend. I'm having a hard time finding a younger female and was considering getting (and neutering) a male. But what I was wondering was, if impaction is a "common" thing amongst older males. ?