Socialite Jean Shafiroff celebrates her ‘49th’ birthday with four gown changes and donations to LA wildfire victims

A woman never reveals her age — or in Jean Shafiroff’s case, even her date of birth.

The socialite celebrated her birthday on Monday with a cocktail party at her Park Avenue apartment, but refused to disclose her actual birthday to guests.

“It’s a security question,” she joked to Page Six, as in something she uses to log into her private info.

But it didn’t stop partygoers from guessing her vital statistics.

“She looks amazing for 60,” one woman said, while another responded with an emphatic, “She’s 71.”

When the guest realized they may have put their foot in their mouth, they added, “I don’t know! But Google has it. All you have to do is Google!” (Google indeed had the same number.)

But Shafiroff told us she “never” reveals her age — or birthdate — and settled on being “perpetually 49,” after she mulled over being “perpetually 39.”

Whatever her age, Shafiroff looked amazing showing off her designer dresses and gowns throughout the evening. The philanthropist who’s famous at galas for her scene-stopping frocks, had four outfit changes during her two-hour event.

“It’s my birthday! And it’s fashion week. I also had a bunch of fashion designers [at the party],” she explained of her multiple wardrobe changes.

Her favorite was the first dress she wore: A white Wes Gordon “birthday cake dress,” as she called it.

She wore the frock after attending Gordon’s fashion show for Caroline Herrera earlier in the day.

“I thought it was a lot of fun, the dress, looks like a birthday dress, a layer cake,” she said.

Victor de Souza, who “mostly does couture,” brought over two gowns for her to wear, and, “Project Runway” alum Malan Breton rounded out the fourth dress.

In lieu of gifts, Shafiroff encouraged guests to donate to the American Red Cross to aid “victims of the California fires.”

“I hate fire… and a lot of people did not have insurance and many people were very poor, or struggled, like this is their only home, and they lost it, and I can’t imagine it,” Shafiroff said of the fires that ravaged the Pacific Palisades and Altadena areas.

“I just wanted to do something… I don’t know if they’re living in motels or shelters or with other friends, and the reality is this could happen to anybody… anything could happen. It’s always nice to do something rather than nothing,” she said.

Julia Haart, Sue Phillips, Ruth Miller, Candace Bushnell, Flo Anthony, CD Greene, and society flacks R. Couri Hay, Anna Rothschild and Norah Lawlor were among the guests.