Hey Now wrote:
When's the last time a true freshman, 19yr old, has won the NCAA and US Championship?
The last time a freshman won the NCAA championships was Dedy Cooper in 1976.
Cooper was an all time great high schooler. He set the national HS record of 13.2 that Skeets Nehemiah broke.
Cooper was 20 years old as a freshman but he was not a redshirt.
Cooper finished fourth in the 1976 Olympic Trials. He does not show in the national championship results, which were a separate meet in those days.
So the answer to your question is: a very long time, at the least.