THIS!! This would do it. You can transfer. You can sit out, you can go play hopscotch and come back to football a year later, but at 23, you age out. This would seal it up nicely.
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Because the average time it takes to finish high school is 4 years, and the average time it takes to finish college is 5 years.
Obviously there are outliers on both ends and a lot of people who start don't finish, but I think we all know smart people who needed more than just 4 years to finish college, not nearly as many who needed an extra year to finish high school.
I mean, I guess you can just play forever then. Cool. Bring back Beniquez Brown and the bowling ball.