The pleasure of one's effect on other people still exists in age - what's called making a hit. But the hit is much rarer and made of different stuff.
When you're not involved, other people's unhappiness seems to be about the funniest damn thing on earth because you think you can solve it, that you are God, that you are above this, and that their unhappiness is just such useless toil and agony. If it's you, it ceases to be a comedy.