Michelle Obama turns 50 later this week, and she is not ruling out future use of plastic surgery or Botox.

The first lady has told People magazine in an interview that women should be free to do whatever they need to do to feel good.

Mrs. Obama, whose birthday is on Friday, adds that she does not imagine resorting to plastic surgery or Botox but that she has also learned to "never say never."

The first lady has never missed a health check up, including a mammogram or smear test, and has had a colonoscopy.

As for diet and exercise, Mrs Obama says she does not "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.