Better A Poor Man Than An Old Man [the way you wrote it suggests moral betterness rather than better circumstances]

My grandma has been ill for a week [use 'since' after a fixed time or event]; she always tells me that it is better to be a poor man than an old man. In her eyes, if she were poor but young, she could make money if she wanted to, but now she thinks she is too old to do anything. Sometimes, I feel she is a pessimistic person who is just waiting to die.
How time flies. When I was a kid, she often took care of me, told me many religious stories, and played with me; she is so kind to everyone.
Everyone will get old; no one can stop it. So, if you are young, please do spend more time taking care of you grandparents, blessing them always.

Thank you for this poignant story/wisdom. david