The way the world is now is only a pale shadow of what it could one day be. We’re still only at the beginning of history. As you get older, despair becomes far easier, almost reflex (whereas in adolescence, it was still cool and adventurous). Pessimism isn’t necessarily deep, nor optimism shallow.
Hmmm. A private interpretation would be like this:
I'm not yet the person I can be, but every day I learn something interesting and every day I seem to manage this great life better.
The despair decreases with age, I think.