I agree with your post. It's very hard, as we get older, to understand what the meaning of our lives could possibly be.
And when we have depression, it's extra hard to be excited about anything .. or find interest in life like we did as kids. I find it torture-some a lot of the time.
I mean, I keep thinking.... okay I could possibly live for 50 more years, and how on earth am I going to make it to that point when I can barely get out of bed each morning.
So.... I can empathize.