Tom Brady, five seasons in his 40s, vs other HOF quarterbacks' five year peaks (keep in mind that Brady has four games left of this season, plus playoffs, as well as awards, which he'll certainly be a pro bowler at minimum, possibly all-pro and/or MVP):
Brady (2017-2021, ages 40-44): 1,912 comp, 2,928 att, 65.3%, 21,756 yds, 7.4 y/a, 161 td, 49 int, 98.8 rating, 2 pro bowls, 1 all-pro, 1 MVP, 2 SB titles, 3 SB app
PManning (2003-2007, ages 27-31): 1,719 comp, 2,588 att, 66.4%, 21,008 yds, 8.1 y/a, 168 td, 53 int, 104.4 rating, 5 pro bowls, 3 all-pro, 2 MVP, 1 SB title, 1 SB app
Montana (1986-1990, ages 30-34): 1,287 comp, 2,008 att, 64.1%, 15,736 yds, 7.8 y/a, 109 td, 56 int, 94.6 rating, 3 pro bowls, 3 all-pro, 2 MVP, 2 SB titles, 2 SB appearances
Rodgers (2010-2014, ages 27-31): 1,560 comp, 2,339 att, 66.7%, 19,777 yds, 8.5 y/a, 167 td, 36 int, 110.3 rating, 3 pro bowls, 2 all-pro, 2 MVP, 1 SB title, 1 SB appearance
Brees (2009-2013, ages 30-34): 2,147 comp, 3,149 att, 68.2%, 24,823 yds, 8.0 y/a, 195 td, 78 int, 102.1 rating, 5 pro bowls, 0 all-pro, 0 MVP, 1 SB title, 1 SB appearance
Marino (1984-1988, ages 23-27): 1,693 comp, 2,804 att, 60.4%, 21,646 yds, 7.7 y/a, 176 td, 97 int, 91.1 rating, 4 pro bowls, 3 all-pro, 1 MVP, 0 SB titles, 1 SB appearance
I mean, what Brady is doing on the field is basically what these other all-time greats have done *IN THEIR PRIMES*, 10-15 years younger than Brady is now.
It's absolutely insane.