> The fact is the world always seems better when you are younger, not because the world necessarily better, but because it's just more pleasant to be young.

I would also mention that when you're young, you're readily learning and accepting new ideas, and that capability/willingness shrinks with age (at least on average).

As a result, the world seems increasingly a foreign place for you as you age - you understand less - partially on the cognitive level, partially on the value judgment level. It's the world of your youth which seems like your home, where your values align with the trend, where you understand what's happening.