• In captivity they have lived more than 30 years.

Mandrillus sphinx typically lives for 20 to 30 years, with a maximum lifespan of 40 years and a theoretical lifespan ranging from 20 to 40 years; the species reaches sexual maturity between 2 years and 5 months and 4 years and 1 month of age. The young are born with their eyes open, and the embryo develops inside the mother. The infant stage begins at birth and lasts from 1 day to 2 years, during which the young spends the first months with its mother. The adult stage lasts from 4 to 40 years, and during this time the species lives in a group and can reproduce.