What comes with age?

In chapter 13, near the little 61 mark, Hobbes says, referring to intelligence and prudence, "I find yet a greater equality amongst men, than that of strength. For prudence, is but Experience; which equal time, equally bestows on all men, in those things they equally apply themselves to." I disagree with this. I have met many adults that have less prudence then some of my friends have. I have also met some teenagers who have less prudence than some of my 11-12 year old friends. So Hobbes can not say the prudence comes with years, because that is not always the case. Therefore, why would he say that?