Travis Kelce's longevity will come down to these factors, ex-NFL star Vernon Davis says

Travis Kelce is at the tail end of his illustrious career, but the Kansas City Chiefs don't seem worried.

Kelce recently restructured his contract with the Chiefs so he'll make over $34 million over the next two years. And his annual average salary is now the most ever for a tight end in NFL history.

Kelce will turn 35 in October as he enters his 12th season in the NFL. That's considered a danger zone in sports, especially in football, where the average career lasts three years.

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