At age 65, Peter Jacobi has been a fisherman for longer than yours truly has lived. Even though he's retired, he still goes out fishing several days a week, the only difference from the working days being that now, he doesn't have to get up early if he doesn't want to.
He still has the internal clock of a fisherman though, so retired or not, he was up and about shortly before six in the morning when I came to visit.