Lions agree Manning is aging gracefully

(Photo: Charlie Riedel / Associated Press)Allen Park — With an 0-2 start, the Lions have plenty to work on this week ahead of Sunday’s showdown against the Broncos.

For a defensive unit that hasn’t played up to last season’s standard — No. 2 in the NFL — the task gets more difficult with Peyton Manning in town.

But the Lions are balancing their awe for Manning, who surpassed 70,000 passing career passing yards last week, with trying to break down the best ways to try to stop him.

It’s a tall order, considering Manning is 3-0 against the Lions during his 18-year career — all by double digits. On Thanksgiving Day in 2004, Manning torched the Lions for six touchdowns.

“(That’s) a long time ago,”…