Harry Potter's parenting.

I;m too lazy to google and I'm hoping for discussion. When was Harry born? 1981 was it? And his kids. What kind of age difference is that? Basically how would the kids be by the time Harry retires? Their thirties?

I'm reading this smutty_claus fic which is heavily featuring Harry and Ginny as parents to teenage kids and I'm just wondering what kind of parents people thing they would be? Good, Bad? Close? Distant.

Which is more likely and which is more useful storywise?