Sacred Haven of Debauchery

Yes, I'm aware. Although I'm not entirely sure about the fifth edition; they might have removed that aspect (but I remember it in 3 and 3.5). I just used what I had on hand.

The increase in charisma and intelligence with age is debatable, or rather, it's obvious that there isn't a direct correlation with age.

I would even say that intelligence tends to decline after a certain age.