Philip Rivers, 39, retires from NFL after 17 seasons

Indianapolis Colts' Philip Rivers (17) throws a pass to Jack Doyle for a touchdown during the second half of an NFL wild-card playoff football game against the Buffalo Bills on Saturday, Jan. 9, 2021, in Orchard Park, N.Y. (AP Photo/Jeffrey T. Barnes)

INDIANAPOLIS — When Philip Rivers first started tossing footballs as a high-school ball boy, he heaved them any way he could. The throwing motion stuck — and success soon followed.