Odd take considering this rule has been in place for as long as anyone can remember and has already been challenged and upheld before. In fact, in 2003 Maurice Clarrett tried and briefly won, but eventually lost an anti-trust case against the NFL for draft eligibility to a three-judge appeals court panel.If this were true then they wouldn't have had to put any rules in to prevent it from happening. They just don't want to have to make those decisions, so now an anti-trust exempt organization is age discriminating against 18-21 year olds.
The NFL & NFLPA agreed to the age limit again in 2020. So while another player could challenge the NFL in court again, it seems like a waste of time & money.
2019 article revisiting the Maurice Clarrett case.
15 years after the Maurice Clarett case, the NFL waiting game for Trevor Lawrence begins
Revisiting Clarett’s lawsuit against the NFL in the wake of Lawrence leading Clemson to the national title as a true freshman.
theathletic.com