You can't choose up sides on a round world.
It makes no sense to worry about things you have no control over because there's nothing you can do about them, and why worry about things you do control? The activity of worrying keeps you immobilized.
Don't program yourself to break down as you age with thoughts that decline is inevitable. Time may be passing for our bodies, but because they house our ageless souls, we never need to see ourselves as old and infirm.
The Tao teaches us to let go of things. Use the 80/20 rule. If you take all your clothes, you'll find out that you only wear 20 percent of them. Take what you have and don't use and circulate it. Give stuff to people who truly need it. After all, we come into this world with nothing; we leave this world with nothing.