This! People need to get a life. I wouldn't have any trouble keeping myself busy after retirement. I do not have nearly enough time for the things I really WANT to do beside work.
This is a great idea but I'm not sure it will work out.
Numbers are touched up all the time, both in politics (e.g. few governments will admit to lowering the employment rate, if things are not working, usually a new way of counting the unemployed is introduced) and in large companies (managers who report "everything's fine" up the chain until it's too late).
Applied to your idea, donors will have to come up with KPIs to meet. Whatever the situation, the KPIs will magically look good. And if there are no KPIs, nobody will dare take the job.