We have a student looking for how many years of unpaid work that people have when they retire and what the reason for this unpaid work is.
1) We measure the amount of unpaid work through the Census.
2) The GSS Time Use cycle has some goodies in terms of unpaid work.
These are cross-sectional data though and not cumulative over a period of a lifetime. I am not familiar with any source of data that provides the number of unpaid work years people have when they retire.