Be before somebody's time - Idioms by The Free Dictionary
be before somebody's time
be before (one's) time
To predate one's tenure or birth. A: "Have you ever seen this show?" B: "No, sorry, it's before my time." I don't know how that project was organized—it was before my time at the company.
be before somebody’s ˈtime be before the period that a person can remember or was involved in: The Beatles were a bit before my time. ♢ There used to be fields behind this house, but that was before your time (= before you started living here).