I began with aikido with almost 47 and I used to think what a pity not have known before about aikido, so that I would begin before. But now I know it was just the time, before my children were to young and more things. Everything comes at the right time in your life
I think you have a point. 10 or 5 years ago I had enough challenges in my life as it was. But about 3 years ago this started to change. Some might call it the midlife crisis: a longing for a new challenge in ones life. So Aikido fulfills something for me now, but that might not have been the case 10 or 20 years ago.