My first was Lupo, an original villager; he died at 54 and lived for quite a while as an elder. I'd guess (I don't know for sure) he was 40-45 when he got it. The youngest I'm sure of is Tappo, son of Olu and Coral, who reached elder status by 42 (though it may well have been 41 or even 40, since he was 39 when I quit and 42 when I came back).

I micromanage the parenting too much to get master parents (I don't let them prefer parenting).