Michelle ObamaMichelle LeVaughn Robinson ObamaMichelle Obama says upcoming memoir shares the 'ordinariness of a very extraordinary story' Colbert: Melania Trump’s jacket was ‘one message she did not steal from Michelle Obama’ Melania Trump puzzles with 'I really don't care' jacket MORE isn't ruling having Botox or plastic surgery in the future.

The first lady, who turns 50 on Friday, told People magazine it's an option.

"Women should have the freedom to do whatever they need to do to feel good about themselves," she said in the interview, which hits newsstands on Friday but was obtained by The Associated Press. "Right now, I don't imagine that I would go that route, but I've also learned to never say never."

She told the magazine that, in addition to her exercise and healthy eating, she never misses a checkup, including mammograms, Pap smears and a colonoscopy.

But some things will change after her birthday — mainly with her workout routine. Obama noted she's looking to do less cardio and weights but adding in more yoga.

"I'm seeing myself shift from weight-bearing stuff — even though that continues to be important — and the heavy cardio and running, to things like yoga that will keep me flexible," she said.

She also hinted at what she'd like to do when she leaves the White House.

"I've got to keep figuring out ways to have an impact, whether as a mother or as a professional or as a mentor to other kids," she said.

The first lady holds mentoring events at the White House for students, in addition to her work with her anti-obesity campaign Let's Move and her military families initiative Joining Forces. She will be one of the youngest first ladies in history, when she leaves the White House, and daughter Malia, who's now 15, will be entering college while Sasha, who's now 12, wouldn't be far behind.

President Obama is planning a birthday dance party for the first lady Saturday night at the White House. Details are under wraps for the "Snacks & Sips & Dancing & Dessert" event, but guests have been told to eat before they arrive and be prepared to show off their dance moves.

There are reports Beyoncé, who is a big Obama supporter, will perform. Beyoncé's husband Jay Z is scheduled to bring his Magna Carter World Tour to the Verizon Center on Thursday night, two days before the big party.

The first lady also extended her Hawaii holiday vacation as part of her birthday celebration, hanging out at Oprah Winfrey's house after the rest of the first family returned to Washington.