Queen Elizabeth II continues to prove that age ain't nothing but a number to her. The 90-year-old royal was spotted riding horses with her head groom (or person in charge of the management and care of horses), Terry Pendry, along the banks of the River Thames in Datchet, England, on Monday. Dressed in comfortable riding pants, a tan jacket, and a head scarf, the queen was in her element as she appeared to enjoy the crisp Fall day. While she didn't make one of her signature funny faces during her ride, it was once again clear that her great-granddaughter Princess Charlotte is taking after her when it comes to their adventurous personalities. Stay young, queen. Stay young.