Zac Efron is his younger brother's biggest fan. On Monday, the Greatest Showman actor was out in full force to cheer on his 26-year-old brother, Dylan, as he ran the Boston Marathon. Zac shared an emotional video to Instagram, showing himself waiting for Dylan at the finish line before giving him a big hug; ""What's the point of all the finish lines we cross in life if there's no one there to celebrate with?" he captioned the clip. Despite the dreary weather, Dylan reportedly completed the race with a finish net time of 2:57:50 and a finish gun time of 3:00:55. Way to go!