The 80-year-old artist married the iconic musician in 1969 but insisted after his murder in 1980 she never thought of herself as a grieving 'widow', instead wanting to carry on their battle for 'freedom and justice', seeing her late husband as a fallen soldier.
She told The Observer newspaper: 'I never even thought of the word widow. I thought I was a soldier. We were both fighting for freedom and justice and self-expression and he just fell in the battlefield.
'That is how I thought of it. That I had to keep going I saw that right away ... [I'm not concerned about old age], no. I feel good. Maybe it's because I don't think about the past so much. The past is so heavy. Part of me, of course, is still carrying it, but part of me is free from it.'
In the past, Yoko has been accused of changing him when their relationship began four years before the end of The Beatles - but she has claimed she allowed him to be more comfortable.
She added: '[He gave me] an energy that said, 'It's all right to be me'. And that's what I gave him also. I didn't change him, as many people think, but he had a side of him that he was not able to express, because of the environment he was in, the people around him, his upbringing and all that.
'Because I was expressing those kinds of things, I think he thought, 'Yes, I can do that'.'