Susan Sarandon only feels all of her 73 years when she "creaks" during her yoga sessions.
The Thelma and Louise star has managed to stay young at heart and fresh of face long into her 70s and claims she doesn't feel any different to how she felt in her youth.
However, she tells Good Housekeeping magazine that she does feel her age when doing yoga.
"I'm dumbfounded by the fact that I'm in my 70s, apart from when I do yoga, when I'm creakier than I used to be," she explains. "I don't think you feel different as you age.
"I feel my curiosity is the same, and my passion. There never seem to be enough hours in the day, just as when I was younger."
The actress puts her youthful looks down to "moderation", avoiding smoking and her mother Lenora Marie's "good genes".
However, the veteran star's sprightliness did not stop her suffering a fall last month which left her with "concussion", a "fractured nose" and a "banged up knee".
Susan has also embraced political activism as a prominent supporter of left-wing U.S. presidential hopeful Bernie Sanders – as stance she puts down to her fears for the future of the world.
"I'd say it's a platform for survival. It's not even like a qualitative thing, it's quantitative. Are we here, or aren't we? Do we have water, or don't we? Do all the coastal towns go underwater? What happens?…..It's real," she adds. "So if I can use my voice to highlight that, then I must do so."