My 91 year old mom has a cataract the doctor doesn’t want to remove. Is there really a reason not to remove a cataract just because a person is 91? She does like to read.
Age might not be the issue.
Some cataract issues are more complicated.
Get a good explanation from her doctor.
Then a second opinion if needed.
BTW, a loved one older than your mom had successful cataract surgery.
Good luck to you and your mom! :-)