Forty-four-year-old grandfather Philip Rivers was happy coaching his son’s high school team and watching NFL games from the sofa when he got the call asking if he’d like to play for the Indianapolis Colts.

“Heck yeah, I’m interested,” Rivers told Colts head coach Shane Steichen over the phone, before racing up from Alabama to Indiana on Monday to strap on pads and practice throwing the ball.

Rivers could take to the field as soon as this Sunday, against the Seattle Seahawks, potentially filling in for stricken quarterback Daniel Jones in a crucial game for the injured-ravaged Colts’ playoff hopes.

“I wasn’t really hanging on any hope of playing again — I kind of thought that ship had sailed,” Rivers said Wednesday, of the stunning turn of events.

Of course, the call to Rivers was no ra

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