Table 2.

Median age (or age range, in years) that males reach hormonal and life-history milestones for yellow baboons, chacma baboons, and geladas.

Hormones (testosterone production)	Yellows	N	Geladas	N	Chacmas	N
Onset of adult T levels$	6.5-7.5	-	6.5-8.0	-	7.5-8.5	-
Peak T levels$	7.5-8.5	-	6.5-8.0	-	8.5-9.5	-
Life-history (maturational milestone)
Testicular enlargement	5.38*	96	-	-	-	-
First dispersal	7.47*	93	4.5-6.5**	70	9.25	26
Acquisition of adult rank	7.38*	48	N/A	-	8.67	15
First sexual consortship	7.87*	31	6.5-8.0	13	8.44	6
Acquisition of highest rank$	8.5-9.5	-	N/A	-	9.5-10.5	-

^*Source: Charpentier et al. 2008, known ages

^**Source: Dunbar & Dunbar, 1975 (p.59), estimated ages

Source: Current dataset, estimated ages

Source: Current dataset, known ages

^$Based on cross-sectional data (see Figure 1 for sample sizes for each age category) N/A Not applicable