Raquel Welch, 76, is smokin' hot at Beverly Hills fundraiser for Farrah Fawcett Foundation

Forget everything you've heard about age-defying serums and the perfect diet. We all just need to copy whatever Raquel Welch has been doing for the last 40 years.

The grade-A bombshell stepped out at a Beverly Hills event for the Farrah Fawcett Foundation -- and we're having trouble believing she's really 76 years old. Sporting a sexy beige ensemble, a Dolce & Gabbana belt and perfectly-coiffed hair that would make Farrrah proud, Raquel is clear proof that age is definitely just a number.

First, take a look at Raquel during her younger years, as an iconic sex symbol of the 1960s and '70s:

Now take a look at her in her '70s: She's still fit as ever, her skin looks amazing, and can we please talk about that hair?!

Raquel was joined by Alana Stewart, ex-wife of Rod Stewart, at the fundraiser benefiting cancer research. At 71, Alana herself is another example of totally defying age -- with long blonde hair, radiant skin and a fit physique, she could easily pass for much, much younger.

Both women were close friends of Farrah Fawcett, who passed away in 2009.