I was thinking how depressing life is in the sense that as you age (assume you live until 90) every single person you've loved will have died, one by one. That's a very depressing thought.
But.
If there is a generation left behind then life is less of this depressing linear trajectory with an inescapable depressing end but more of a cycle whereby as you age and as you lose people new life is born and the energy of your loved ones recycled.
You don't have to have children. I'm never sure I want them but for me the cruel reality of death only makes sense when combined with the addition of new life. It's the only thing that makes me feel better about the inevitable loss that time will bring with it, the potential life it also carries. That has to be worth smelly nappies and sleepless nights.