It depads if the NFL player what to retier then they need a replasement so you don't know if a player is gone or not.
4
the youngest age to ever enter the nfl was 19yrs old.
Four - two from each conference.
as many as they can fit in
The Packers joined the NFL for the 1921 season.
Tomlinson's first season in the NFL was 2001.
over 500
NFL teams can carry rosters of 53 players.
1920
1937
1976
1985