Every athlete seeks that sweet spot between development and decline. But how many know exactly when that is? In ESPN The Magazine's Age Issue, stats gurus pick peak performance ages for key positions in NFL, MLB, NHL and NBA.
When new coaches have success, they usually don't deserve all the credit thanks to a statistical law of gravity called "regressions to the mean." So fans shouldn't fall in love with the new clipboard holder until they see what he does over time.