Contrary to the celebrity trend of nipping, tucking and lifting every bit of unwanted skin, Hollywood's older sex symbols may be better off avoiding the knife.
"There's certainly a sexiness and an attractiveness in being comfortable in your skin -- the skin that's still in the same region of your body as it was when you started out," Collis said.
By not overhauling their time-worn facades, the "silver foxes" retain the features that made them appealing in the first place. They stand out from the pack of aging celebrities desperate to look younger.
As for surgery, there's no way to know which of the older stars have taken the plunge, and they're certainly not telling. But Musto said whatever they've done, it's not major.
"They haven't tampered with their looks in a way that makes them unnatural," he said. "It's a way to remain individual. Everyone who's had surgery seems to go to the same doctor, or at least it looks that way."
What do Hollywood's older sex symbols have that many younger stars do not? Private lives, for one.
While it might be fun for young stars to see themselves splashed across the cover of sumpermarket tabloids, that fleeting public fancy doesn't necessarily bode well for career longevity.
"We don't know an awful lot about their private lives. Meryl Streep was never photographed barhopping through Hollywood," Collis said. "One does wonder if that mystique contributes to their attractiveness and their ability to retain it."
But not every member of Hollywood's younger generation is tabloid trash.
Entertainment Weekly's Collis pointed out three young women poised to become senior sex symbols: Emily Blunt, who recently won a Golden Globe for the TV movie "Gideon's Daughter"; Rachel Weisz, who has made the transition from arm-candy roles to serious parts; and Reese Witherspoon, whose role in "Walk the Line" won her the Best Actress Oscar last year.
As for the actors and actresses splashed across tabloid covers on a weekly basis, Musto advised they take a cue from the grand dames of the Hollywood game.
"Learn to say 'no' to certain things. You don't have to do every role that's offered, you don't have to attend every party you're invited to," he said. "You don't see Helen and Meryl running around at 3 a.m. Pace yourself, worry about your health and make some cautious career choices -- don't just do whatever's offered to you because you're hot."