The films remain ambiguous on Natasha Romanov's age, simply implying that she is old enough to have been nurtured by the KGB. In the comics, though, she has been able to survive for decades thanks to different medical operations and pieces of biotechnology. As the KGB fades from memory, it's increasingly likely that the youthful Natasha is considerably older than she appears. She's reported to be 70 years old in the comics!