Brian Owen wrote about it in the Argus today. Our youngest ever line up in the top flight (just) was in 1981 v Coventry
Albion also won 4-1 and the average age was 23 years and 259 days.
https://www.theargus.co.uk/sport/24097790.brightons-new-club-record-4-1-win-versus-crystal-palace/