Gillian Anderson, 51
‘The truth is out there’ when it comes to finding an answer to how Gillian Anderson has reversed the effects of aging. The 51 year old actress reprised her role as Agent Dana Scully for the 2016 reboot of “The X-Files” and has recently made television appearances on “Hannibal” and “American Gods.” The actress has also made numerous film and stage appearances over the years and is set to star as Margaret Thatcher in season four of “The Crown.”