Astin , 44 , already has 10 marathons under his belt .
Astin , 44 , already completed Ironman 70.3 Vineman in Northern California in 7 : 25 : 19 .
Astin , 44 , already has 10 marathons under his belt , and completed Ironman 70.3 Vineman in Northern California in 7 : 25 : 19 .