what's a good age to have kids and get married

my boyfriend and I are young so obviously I don't want kids atm (I'm not stupid) but we've been dating nearly 4 months and I can honestly say I'm In love with him, IF we date until I'm 18 and he's 20 (which I'm 15 and he's 17 now) would that be too young to be engaged even If It's four years of dating? and what's a good age to have kids 
(I'm not trying to get ahead of myself bc I'm aware I may not be with him forever even though It feels like It now)

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