Why old people face so many problem in the society ?

In my opinion , old people have to faced many different kind of problem in the society.
When a person is old many illness started to bother them , they cant really
do anything to the society so when they go out to look for job to earn a living ,
no one will wanted to hire them and the old people in the society will all be left jobless.
Some old people will be send to old folks home till to some personal problem.
and the olds will feel that they were left aside by the family and will no longer feel
happy.