Oh I will not interfere much with them - I think the best place for a parent is to let them alone.
I agree with you, 100%! I have never interferred in my children's adult lives. I'm here with a shoulder, a tear, a hug, but never advice (unless they beg me for it.)
My motto is: "Not my pigs, not my farm.
I did my job. Let them do theirs.