There are days when I feel every bit 50+ and mostly it's when I read or hear politicians wrangling over the same old subjects they've been going nowhere with for my entire life. It just makes you feel like nothing changes for the better, that there are no solutions to the really 'big' questions - just an endless procession of people who think they have new ideas. OK, so maybe everyone should take an interest in current affairs, use their vote etc. But not at the expense of being depressed by politics on a daily basis.
I find if I keep away from listening to these people, I actually feel younger, more optimistic and generally happier about life.