[harimau777]

Talking just from the perspective of having work that contributes to society (as opposed to the economic aspects of work) I think volunteering is a good idea.

There was a man at the church I grew up in who was seriously disabled in an industrial accident who volunteered 40 hours a week at the local library. Similarly my grandmother volunteered at a hospital into her 90s. In her case it actually saved her life when she had an aortic aneurysm that almost certainly would have killed her if she hadn't already been at the hospital when it happened!