大卫的爷爷在过81岁生日时许下了一个心愿，愿自己能重返18岁。一次，爷孙俩在车上嬉戏出了车祸，结果爷孙俩的年龄互换了，老人成了大卫，并到大学里重新体验了年轻人的生活。

A misfit group of New Mexico cowboys find themselves on the journey of a lifetime when their crooked-footed racehorse qualifies for the Kentucky Derby. Based on the inspiring true story of Mine That Bird, the cowboys face a series of mishaps on their way to Churchill Downs, becoming the ultimate underdogs in a final showdown with the world's racing elite.