(AP) -- Michelle Obama turns 50 later this week, and she isn't ruling out future use of plastic surgery or Botox.

The first lady tells People magazine in an interview hitting newsstands Friday, her birthday, that women should be free to do whatever they need to do to feel good.

Mrs. Obama adds that she doesn't imagine resorting to plastic surgery or Botox but that she's also learned to "never say never."

The first lady has never missed a health checkup, including a mammogram or Pap smear, and has had a colonoscopy.

As for diet and exercise, Mrs. Obama says she doesn't "obsess" about what she eats but makes sure to include fruit and vegetables.

Her workouts have also evolved to include things like yoga that she says will keep her flexible.