In addition to her acting talent, Fellowes said her natural appearance -- wrinkles and all -- can account for her longevity in a profession famous for showing preference to the young.
Smith, 78, has a career as an actor spanning 60 years, winning awards and accolades like dame commander of the British Empire, CBS News reported Saturday.
Despite her slew of roles over the decades, Smith said she's never received the level of fame she's recently gotten as Violet, the Dowager Countess of Grantham in "Downton Abbey."
"I am familiar to people now, which is what I was not before," she said in an appearance on "60 Minutes" set to air Sunday.
Notable deaths of 2014 [PHOTOS]
Tatiana Maslany to make her New York stage debut