Are you wary/scared of aging?

When under 30 I never gave it a thought. I then started to be a little bothered but not worried. At 50 it was obvious that I was slowing down and this concerned me as I was a keen tennis player and refereed football. At 65 I was aging but I did not seem to be any different. At 73 I needed a new knee and the other is causing problems. Still active but I guess that to others I probably look old but to me in the mirror I see no difference.