Human will become old

Is really sad to see the people around ageing ...
Today my auntie and my elder bro bought a walking support back for my grandaunt ...
My grandaunt had to depend on the walking support to walk properly or else she will be like humpy dumpy ... She had been falling down in the past few days ... Don't really know what exactly happen to her toes ... The 2nd toe is like on top of the big toe... This causes her to fall easily ... She used to do all the housework effectively but now she can't even stand properly ...
Seeing the walking support really makes me feel sad ...
Is it our fault that causes this to happen or human will have to face this sooner or later ?