You're right oo, even me , I can't imagine how my old age will be, imagine able body person, you can do whatever you want, trekking, walking, running, eating whatever you want, doing whatever you mind desired, but at a certain age, you can't do all this things anymore, you know that its will be really hard to adapt to that kind of life, that's why most of the age people can get angry at any small thing because they are frustrated and unable to do what they desired.
Good luck @kidi40