(Also, AD&D had these, and it was kind of a nightmare. Totally optimal to make elderly wizards with all those Int bonuses.)
Also totally impossible per RAW, as starting age ranges were given - can't remember offhand whether in the PH or DMG - and all fell into either the young-adult (-1 Wisdom) or mature (no stat changes) category for any given race.
The stat changes by age were there, I think, mostly to handle aging effects e.g. ghosts and what they'd do to the PCs, and to give guidance when designing NPCs or opposition.
Because PCs are individuals, and population averages matter little unless you have literally picked the PC randomly out of the population. "It is likely that Sally would be weaker than Gutboy Barrelhouse" is not relevant, because we have their stats and can see the reality of the situation.
However without seeing their stats it's still a valid statement...particularly if Sally is a Human and Gutboy is a Dwarf (which he is, where first presented).
I don't have any gender-related stat changes in my game - I've bigger fish to fry in the design-side cookpot.
That said, I could sort-of see an argument for having them as long as for every bonus there's a roughly-equal penalty (e.g. 1- str, +1 con) to stats that are of relatively equal importance. But any straight penalty without a corresponding bonus, or straight bonus without a corresponding penalty, is right out.
(And for real, quit with the XP police thing. If you have a problem with their post, take it up with them.)
Well, giving xp kinda does imply support for the position taken, so being called to defend said position shouldn't then be any big surprise.
Lan-"one of those fish, in some non-Human game cultures such as Elves and Dwarves, is whether one gender is more likely to adventure than the other"-efan