If the average human life span was 40 years, how would you live your life differently?
The main difference is that I probably would have had children earlier.

I graduated high school and went to college. (wouldn't change)
I was married when I was 21 and graduated college the next semester. (wouldn't change)
We had Alia when I was 27. If people only lived until they were 40, I guess B and I might have married even earlier, but I probably would have wanted children sooner.
I probably wouldn't live my life any different, because I have no big plans for my life. Just living and loving with my family.