Pinball is a reactionary game, it requires reflexes to play and an ability to accurately predict the path of the ball.
Comparing it to bowling, golfing or playing an instrument etc makes no sense. It's not like the bowling pins or the golf ball move and you have to react to it.
Throwing a strike in bowling can be achieved by repeating the same motion over and over again. Barring some sort of physical ailment that prevents you from doing that, age shouldn't have an impact on that.