Oigarche: the age at first ejaculation.
In our study the mean age of the age at first ejaculation in Belgium is 13 yrs 2 mos, corresponding with a testicular volume of 10 ml with the orchidometer of Prader. These data are in agreement with those of Laron et al. (1980) and Richardson and Short (1978). The relationship between the age at first ejaculation and the testicular volume means that once this testicular volume (10 ml) has been reached, the question about the presence of ejaculations no longer need be posed "prematurely" (and becomes the possible cause of feelings of inferiority). The age at first ejaculation certainly can be used as an index of genital and sexual maturation in male puberty.
D000293:Adolescent; D000328:Adult; D000367:Age Factors; D001827:Body Height; D001835:Body Weight; D004542:Ejaculation; D006801:Humans; D008297:Male; D012741:Sexual Maturation