Always thought it had to be due to more than just the fact that perpetual singles are more likely to get enough sleep, don't have as many financial pressures etc. Hmmmmmmm

Bwwahahaha!

Oh yes. Paying the mortgage and the taxes by yourself without even the possibility of a 2nd income if you lose your job takes all those financial pressures right off! ;) Nor does it mean you aren't a "family type", because you may still have aging parents and grandparents to take care of.

If there's a difference in attitude, it's not less pressure or concerns, it's just different concerns. Married folks may have more issues getting along with a spouse, but they also have a built-in safety mechanism when things go wrong. If you're single, you survive and succeed on your own, or not at all, and "not at all" can be pretty harsh.