04/09/2013 12:07 pm ET Updated Apr 09, 2013

At Age 75, Jane Fonda Says, 'I Feel Really Young!' (VIDEO)

Actress Jane Fonda has lived a full and busy life. She's won multiple awards, made headlines with regard to her controversial opinions on the Vietnam War, battled breast cancer, had both high- and low-profile relationships and raised children -- including her adopted daughter Mary Williams. Now at age 75, Jane Fonda says that she has entered her "third act" of life. In this clip from "Oprah's Next Chapter," she opens up to Oprah about several life lessons she's learned on her journey.

Rather than fearing this final stage of her life, Fonda says, she finds it exhilarating. She says she isn't scared of death -- something she first realized when she was diagnosed with breast cancer several years ago. "That was a good test, because I always said 'I'm not afraid of dying.' And I wasn't," Fonda says in the clip. "...[I thought], 'maybe I'll make it and maybe I won't.' I didn't get scared."

One reason Fonda might be finding her "third act" exhilarating may be due to her strong relationship with legendary music producer Richard Perry. Fonda calls Perry her "lover" -- "[Saying] 'boyfriend' is a little weird when you're my age," she says -- and says that sex at age 75 can be better than ever. "We're lucky, we women, as we get older, because we don't have to worry about the ups and downs of things," she says with a laugh. "And we know our bodies better and we're less afraid to ask for what we want. And you learn what's important."

In the clip, Fonda also talks about her adopted black daughter Mary Williams, saying, "My life… has been very unorthodox. So, to me, it's perfectly normal to have a black daughter. From the time I was relatively young, difference has been comfortable for me."

As a mother, Fonda says she is "so unbelievably proud" of Williams and is also proud of her own life, reflecting on her experiences as a whole. "You spend your life exploring -- I'm paraphrasing T.S. Eliot -- and at the end of all your exploring, you come back to where you started and know it for the first time," she says. "So, I'm old and I feel really young!"

"Oprah's Next Chapter" airs Sundays at 9 p.m. ET on OWN.

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