1986, Craig Bielert, ""Male chacma baboon (Papio ursinus) sexual arousal: studies with adolescent and adult females as visual stimuli.", page 369-383:
It had been reported for Mucucu silenus, another species with perineal elaboration, that although subadult (recently menarched) females initiated more sexual interactions than did adult females […]
1989, University of California, "The Journal of the Egyptian Medical Association", page 163:
Atallah, (1978) reported a mean menarched age of 12-59 for well of girls in Cairo.