I'd say that when your son is 61 years old your responsibilities to them and any parenting you can do to guide and assist them is pretty much done. I don't think the idea of "cutting them off" holds quite the same weight and especially not when they've made the choice to befriend and associate with convicted sex offenders and invited them to stay over at your house.What’s his age today got to do with it?
And again, he didn't just sleep with a 17 year old. He slept with a 17 year old who had been groomed, trafficked and coerced to do so.