If Jason Kidd needed yet another reminder about his protracted longevity, the old memory bank was jostled again on Sunday when Kenyon Martin walked into the Knick locker room and donned a uniform in the neighboring cubbyhole. Here was his teammate from the Net glory years back in the early 2000s, which seem like several lifetimes ago. “We converted a few fans,” Martin said, recalling better days in East Rutherford. “He’s my guy. We’ve stayed close.” Kidd is in his 19th season, and it isn’t always easy watching him play basketball anymore. That confident jumper from early this season has vanished completely, and he would prefer not to hoist it much anymore. He will turn 40 next month – old, even by Knick standards – and on too many nights recently Kidd has looked every bit his age. The glue is unglued. Kidd came into the Garden having missed 10 of his last 12 3-pointers, and then he missed six more of them, often badly. Kidd fired an embarrassing air ball in the fourth quarter, from wide open beyond the arc. He clanked one more for good measure in the 99-93 victory over Philly, then rushed out afterward and let his teammates speak in defense of his skewed radar. “I told him, ‘Keep shooting,’” Tyson Chandler said. “He does so many little things when he’s out there, I don’t care if he goes 0-for-10.” It is becoming a bit of a crisis, nonetheless, for a contending team with a flawed backcourt. Kidd is the designated quarterback, a playmaker who reads the game and sees the whole floor – even if it’s harder for him now to get to a spot or defend the quicker guards in the league. Read more: http://www.nydailynews.com/sports/basketball/knicks/knicks-shot-kidd-find-article-1.1272504#ixzz2LunIAvkD