I was killing myself working but now I am all broken and worn out and for the last 3 years have been on a pension.
Mentally I feel the same.
Sometimes I feel rather guilty for sitting down and watching TV during the daytime but when I try to even start something that I once used to do all day everyday I quickly realise my back and hip and knees wont let me. 
Getting old just makes you realise there are many more things that you cannot do or cannot eat anymore.........waaaaaaahhhhhhhhh.