By Daniel Bates At 69 years old, Bill Belichick is closer to the end of his career than the beginning. And although he still has plenty of coaching left in him, questions have surfaced as to who will eventually replace him in New England following Josh McDaniels‘ departure. Enter Patriots linebackers coach Jerod Mayo? Mayo, a former Pats linebacker himself, has built a strong coaching resume in a short period. Speaking to WEEI’s “Merloni & Fauria,” Mayo sounded very open to eventually taking over in Foxborough. “There’s no secret, and I’ve said this from Day 1, that I want to be a head coach i…