The Barbarella star revealed that she views getting older as an "ascending staircase" and wants to encourage senior citizens to spend more time enjoying their later years to the fullest.
"Ageism is unfortunately alive and well and I'm trying to do my small part in doing away with it. I think it's going to happen anyway. We are growing in numbers. We older people are vibrant and healthy and living way longer than we did 100 years ago," Fonda explained to The Huffington Post.
"It's important to be thinking about how we make the most of it. The old way of looking at ageing is an arch - you're born, you peak at mid-life and then you decline into decrepitude. The way I look at it is like an ascending staircase - even if your body is weakening, in many ways, in terms of wisdom and consciousness and soul and spirit and even health because we're staying healthier so much longer, we're really ascending a staircase rather than sliding down a slippery slope."
Fonda went on to say that she relied on a "life review" in order to determine how to spend the last decades of her life.
"As I was approaching 60, I realised, 'Holy cow, this is going to be my last act, my last three decades and I have no idea what I want to do with them.' I realised in order to know how to navigate the last third [of my life], I really had to know what the first two-thirds have been about," she recalled.
"So I did what I later found is called a life review and it's something psychologists advocate that people do. It means going back and not just saying I did this and that - it means really researching yourself and how you felt."
Fonda recently revealed that her father's criticism of her weight as a young girl gave her a lifelong obsession with her appearance.
The 73-year-old recently lashed out at shopping network QVC for cancelling a scheduled appearance following pressure from political activists, though QVC later denied Fonda's claims.