Here's the WaPo-Paul interview that Steve Marinucci mentioned in his article about the Beatle (not likely) retiring.
For an official senior citizen -- impossibly, he's now 67 -- McCartney looks remarkably youthful. He's slim, almost slight, and truth be told, could even stand a few more pounds. The famously cherubic face is fleshier and lined just enough to remind you that McCartney isn't 21 anymore. The tousled hair is a flat brown. This is reassuring; who wants a Beatle, particularly the doe-eyed, ever-boyish Paul, to seem old or even to age at all?
The even better news is that McCartney's voice remains as strong and supple as it was in his youth, even in this, his 50th year of performing. Critics generally applauded the vocals and writing on his last album, "Electric Arguments," released last year under his Fireman alter ego. But McCartney is a revelation in concert. He plays straight through for about 2 1/2 hours each night, offering more than 30 tunes from his vast catalog. The set list ranges from such sweetly sung classics as "Blackbird" and the inevitable "Yesterday" to the frantic, voice-shredding chestnut "I'm Down." (On this day, even his sound check is a mini-concert, featuring a dozen or more songs, including a lovely version of "Midnight Special.")