Female gorillas reach maturity at ten years old. There have been instances when the female will reach maturity earlier in life - sometimes as young as six years old - but the average age is ten. A mature female gorilla will ovulate on a cycle that closely mirrors that of a human. What happens next is quite interesting. Gorillas, in general, live in groups. When a female has matured, she typically leaves the group to find a male to settle down with.
This might involve changing groups several times before she’s happy, as female gorillas can be rather picky about who they settle down with.Once the female settles down, the cycle starts all over again with her children. If a female develops maturity earlier, they may leave the group earlier, but no one is quite sure of this.