Canada.

It's hard to say.

My parents had 3 kids, a house, and were well on the way to retirement at my age. However they lived unhealthier lifestyles both mentally and physically.

I have no kids, a house (although much smaller than the one my parents had and in a cheaper town), and have a long way to go before retirement. I generally have much less stress, I don't drink anywhere near as much as they did, and I don't smoke.