yeah he's old enough to get her pregnant by now. Females give birth at 21-28 days within mating. Also The babies need to be seperated at 21-28 days. I was just wondering why you had males and females living together? Were you trying to breed? Also boy mice should not live together because as they mature they become very territorial. This can cause alot of fighting in alot of cases a fight till the death. Some boys do get along but it is very rare even for
litter mates. Also the femle needs more protein if she is pregnant which you can fget in a milk bone or
kitten food. That is vital for the babies survival. If you need more info please let me know. Also if you are trying to breed please do more research on this and breed from quality mice from breeders and not petstores. I hope this info helps.
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When I'm down my pets turns my frown upside down


2 Dogs: Harley and Daisy
6 Rats: girls- Anita, LE, Nethie, & Onyx boys- Buddy and Splinter
10 mice
1 1 gecko