I used to be far more optimistic than I am now, but I reckon I am sitting around 51/49 in favor of optimism.
My percentage pre 30s were like 1% optimism lol. I had no clue of optimism because of my parents who used me like an ATM. Now that the sands of time are shifting, I am getting optimistic in late 30s. I know it's half life gone. I am optimistic for no reason and have no idea for what, God knows.
It's good to be optimistic, I can sense the optimism in others now. Prior to that It was hard for me to see the side.
I think having a little hope is important for a good life, especially when life is harder. Something to look forward to gives us will to overcome a lot of adversity - and challenging parents.