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prev 20 of 21 next. Mike Trout, 19 years old. Prev Next. Trout was just two months shy of his 20th birthday when he debuted for the Angels in July of last year, and was considered by most MLB scouts as the best prospect in all of baseball, even besting fellow phenom Bryce Harper.
Bryce Harper had the best age 19 season of all time but he followed it with a pedestrian 3.8 fWAR at age 20 to virtually kill his chances. It's certainly more likely for Trout than anyone else, but averaging eight wins for the next 19 years seems very unlikely.