"Will you still need me, will you still feed me, when I'm 64?" sang a twentysomething Paul McCartney in his semi-confrontational love song, an interrogation of romantic commitment through the trials of physical decay.
For Jason DaSilva, the documentary filmmaker behind "When I Walk," McCartney's question is neither abstract nor remote. Diagnosed with multiple sclerosis at age 25 and robbed of his mobility and motor skills in a frighteningly short spell, DaSilva can't help asking his girlfriend over a bowl of noodles whether she'll feed him when he can't hold a spoon anymore. They've been together for less than a year. "That's an overwhelming question to me right now," she replies, averting her gaze.