Former President Bill Clinton’s speech at the Democratic National Convention on Tuesday night was certainly memorable, but so was his appearance.

Clinton, 69, looked leaner, younger and more refreshed than ever, as if he had experienced a Benjamin Button moment—aging backward, albeit very subtly.

While we don’t know if, or to whom, Clinton turns for any possible nips and tucks, we had some experts weigh in on whether they think his improved look is the result of makeup, fillers, surgery or all of the above.