I'm 35, DP is 32 ...

DS1 is 8yo in yr 3
*insert new partner here*
DD is 5 yo in Kindergarten (3y 3w age gap)
*insert new partner here*
DS2 is 3yo (2y 5w age gap)
DS3 is nearly 9 months (2y 4m age gap)

So at the moment, about 7.5 years from eldest to youngest ....

I am trying to convince DP to go for #5 and possibly #6 and he was actually looking at bigger cars on the net today, after finding out about new child restraint laws that might be coming into legislation .... so who knows!