What age is appropriate to give the sex talk?

Sulema
I have an 8 year old we have not given any talks or anything about sex or anything regarding sex. We recently had a doctors appointment
And he's not circumsized so I was unaware that he needed to pull the skin back other than when he washes so she was telling him to tug gently and stuff like that when he's in the shower so this made me think maybe I need to talk to him about it but I never did before because I thought he was still to young but also know he  has questions about were babies come from so maybe I should but don't know how to approach it. Is 8 still to young?