He's not losing his hair, though color seems to be an issue.

He does have grandchildren, though no Vera, Chuck or Dave.

He has been known to do a little gardening work, "digging the weed," so to speak. In fact, one of his multiple marijuana busts was for growing the stuff on his Scotland farm back in the early '70s.

Given the recent upheaval in his personal life, it's unclear who'll feed him, though there's no doubt he'll be taken care of.

Yes, the cultural alarm clock that Paul McCartney set 39 years ago is ringing. The man who sang "When I'm Sixty-Four" in 1967 turns 64 today.

"I do remember that on the (song's recording) session, we all figured out it would be 2006 when Paul was 64," Beatles engineer Geoff Emerick recalled on the phone from Los Angeles, "and we had a good laugh about that and wondered what we'd be doing."

That McCartney is reaching the age that he whimsically imagined so long ago is an unavoidable milestone, a ready-made occasion for comparing snapshots, then and now, of the singer and his contemporaries. "You'll be older too," after all. It's also the inevitable moment when the words of the young man are shoved into the face of the old — or let's just say older — man.

At least McCartney's tongue-in-cheek portrait of his dotage was affectionate enough that it shouldn't be too tough for him to swallow. Fellow '60s icons Pete Townshend and Mick Jagger have had to choke on the strident, aging-averse declarations of their younger selves. Townshend has become a walking ironic counterpoint to the classic line he wrote for the Who's "My Generation": "I hope I die before I get old." As for the wiry Stones frontman, he once was famously quoted as sneering, "I'd rather be dead than singing 'Satisfaction' when I'm 45." Jagger was 62 when he sang it at this year's Super Bowl.

McCartney didn't equate old age with death in "When I'm Sixty-Four," but his song is nonetheless revealing in the way it views the autumn years from a spring chicken's perspective. The ex-Beatle has told interviewers he wrote the song when he was "about 16," placing it in the late-'50s, eight or so years before the Beatles finally recorded it for their landmark album "Sgt. Pepper's Lonely Hearts Club Band."

WOOING THE PARENTS

"When I'm Sixty-Four" is a vaudeville-style toe-tapper in which the singer wonders whether his sweetheart will still be around to dote on him and to share a mundane life when he's "older, losing my hair, many years from now."

He'll mend fuses; she'll knit. "Doing the garden, digging the weeds/ Who could ask for more?" he asks with a straight face, as if that prospect really excited young people back then. "Will you still need me/ Will you still feed me/ When I'm sixty-four?"

You're singing along right now, aren't you?

In "Paul McCartney: Many Years From Now," Barry Miles' 1997 biography that takes its title from the song, McCartney says he made a point of putting "the tongue very firmly in cheek" so the song wouldn't come across as "too vaudevillian."

" 'Will you still need me?' is still a love song," he said. " 'Will you still look after me?' — OK — but 'Will you still feed me?' goes into 'Goon Show' humor." (That last part is a reference to a 1950s madcap British radio series featuring Peter Sellers.)

When the Beatles finally recorded this "rooty-tooty" song (as McCartney called it), it was an anomaly both on the "Sgt. Pepper" album, where it's easily the least psychedelic track, and in the larger rock world. You didn't hear other rock bands recording songs driven by multiple clarinets, though McCartney's fascination with the baroque arrangements on the Beach Boys' 1966 classic "Pet Sounds" is felt here.

Emerick, who details his experiences recording the Beatles in his new book "Here, There and Everywhere" (Gotham Books), recalled speeding up McCartney's voice to make it sound more youthful. The engineer said he thinks McCartney finally decided to record "When I'm Sixty-Four" for "Sgt. Pepper" after pulling off the glorious string arrangement of "Eleanor Rigby" on the Beatles' previous album, "Revolver." Another frequently cited theory is that McCartney was paying tribute to his father, Jim McCartney, who turned 64 in 1966.

"When I'm Sixty-Four" almost didn't wind up on "Sgt. Pepper." It was the second song recorded for the album, after "Strawberry Fields Forever," and when Capitol Records insisted on taking two songs to release as a single (single and album tracks often didn't overlap back then), "When I'm Sixty-Four" was targeted as the flip side to "Strawberry Fields." But "Penny Lane," which drew on McCartney's youth in a different way, became the choice instead.

So while "Sgt. Pepper" was blowing the minds of young fans in the Summer of Love, the nostalgia-seeped, undeniably catchy "When I'm Sixty-Four" was wooing their parents, just as the McCartney-sung version of Meredith Willson's "Till There Was You" (from "The Music Man") had done when the Beatles played "The Ed Sullivan Show" in 1964.

At the same time, there was something audacious about the Beatles recording such a song at the height of their popularity.

" 'When I'm Sixty-Four' stood out when it came out as a blatantly nonrock 'n' roll tune by the most famous rock 'n' roll band in the world," Boston-based rock critic Milo Miles said. "Also, the whole youth culture was so potent at that time that the idea of the Beatles singing about being 64 was part of the mind-blowing aspect of it."

In the end, "When I'm Sixty-Four" may actually have become more popular among non-Beatles fans than Beatles die-hards.

THE NEW 44

Since its release, "When I'm Sixty-Four" has become a standard, a song you routinely encounter and probably hum along to. A few years ago Julian Lennon, John's first son, even sang it on an insurance commercial.

Now the song has become a touchstone for baby boomers realizing they're catching up with an age that used to seem so distant. "When I was a kid, 64 was old," said Mark Lapidos, 58, founder of the Fest for Beatles Fans. "(Now) the baby boomers are in their late 50s or turning 60; we don't consider that old. Sixty-four was goodbye. Now it's just getting started."

Yes, 64 is the new 44. Since 1967, the average life expectancy in the U.S. has risen from 70.5 to 77.9 years. (The figures tend to be slightly higher in Britain.) In the 1960s, rock was a young field populated by young people. Now sixtysomething performers such as McCartney, Bob Dylan and the Stones remain active, touring rock 'n' rollers.

Yet turning 64 still feels significant, particularly in the case of the Beatles, given that Lennon and George Harrison are no longer around. "It's kind of poignant," said superfan Terri Hemmert, "because only two of the four got that far, and 64 isn't that old."

This may be a bittersweet birthday for McCartney for other reasons as well. "When I'm Sixty-Four" envisions growing old alongside your longtime sweetheart, a scenario that evaporated for McCartney when his first wife, Linda, died of breast cancer in 1998 after almost 30 years of marriage. He remarried a young activist named Heather Mills, but their separation was announced last month.

McCartney's publicist said he has no plans for any public marking of this birthday. But his mind-set is no doubt in line with those never-say-old boomers.

In fact, he has taken to repeating a story that's about, believe it or not, Hemmert's mom. When Betty Hemmert played "When I'm Sixty-Four" at a recital at her Cincinnati retirement community, she changed the lyric to "When I'm Eighty-Four" because 64 just didn't seem old to anyone there. Terri Hemmert related this anecdote to McCartney when he was in town in 2002, and, she said, "he just broke up. He was in hysterics."

McCartney subsequently told this story in a wire-service interview last year, adding: "I might be taking a hint from her next year."