I guess it is a question that many of us have wrestled with over the years.
Many dads have an opinion one way or the other.
I do not think there is a right or wrong response. Some will say it is easier when they are younger, others will say it's easier when they are older. Some will say teens can't deal with it because it gets in the way of their own sexual development. I'll tell you my approach with my son, Peter, a number of years ago. I was out for years, had a live-in partner for years, and just about every friend we had was gay.