At 37, Frala is coming to the end of her reproductive years; however, the fact she gave birth recently (2015) will hopefully give her an advantage to conceiving. Gorillas her age, who have struggled to conceive are usually those who haven't bred in years/have been on contraceptives. Do you mean Mbeli (Mjukuu's mother)? She last gave birth late 2017 so I'd say the earliest we'd see another infant from her would be 2020. That could tie in well though if Frala gives birth in 2019 (only a year between them).