49ers’ Elvis Dumervil faces old question

On Tuesday, the 49ers' newly signed pass-rusher met the Bay Area media for the first time and he stopped a reporter in mid-question after his "age" was invoked. Dumervil is 33. [...] the reporter noted that's old for an NFL player. [...] the 49ers hope Dumervil isn't merely a mentor; they signed him last week because they believe the five-time Pro Bowl selection can still be a menace to quarterbacks. Not surprisingly, Dumervil, who ranks seventh among active players in sacks (99), thinks he'd ready to showcase his 2014 form (17 sacks) after an Achilles injury partly explains his relatively paltry production over the past two seasons (9 sacks in 24 games). Dumervil underwent surgery in 2016 to repair an Achilles tendon that was 60 percent torn. The injury became progressively worse during the 2015 season, when he played all 16 games despite dealing with Achilles pain starting in training camp. Dumervil could share snaps with Arik Armstead at the "Leo" defensive end position, which is reserved for the team's most ferocious pass-rusher. [...] Dumervil hopes to prove he can still do what he's done for most his decorated NFL career. Rookie quarterback C.J. Beathard signed a four-year...