My grandfather was mildly obsessed with organizing and documenting the history of his life: a memoir about a career in the military from 1938 to ~1975, growing up in a Depression era Oklahoma “dirt farm.”
There was also geology. I think all old people have that project. Us soon to be old Gen-X’ers have more records around than probably any human in history, especially the nerds. Soon, we’ll all be obsessively organizing the equivalent of our 40 year slides and boxes of receipts. Personal digital gnolling.