Brigitte Nielsen is opening up about aging and her life raising a 4-year-old at age 59 in a new essay for the Sunday Times.

The Red Sonja star was 54 when she gave birth to daughter Frida, youngest of five children and, Nielsen says, "love of my life."

The Danish actress pushes back against assumptions — and her own initial fears — that she'd be "exhausted" having a baby at a mature age.

 If anything, she says, having Frida has put a spring in her step. 

"Men say to me, 'You’re nearly 60 and you’ve got a 4-year-old. Why aren’t you exhausted?'"

Nielsen, who shares Frida with fifth husband Mattia Dessi, 43, writes. "I say to them, 'I’m a woman.

We mothers are strong. Before I gave birth to her I did think, 'How am I going to do this?'

This is going to be exhausting,' but I just turned 59 and she gives me so much energy.'

"I like to keep in shape, but I don’t spend 10 hours a day in the gym," the Beverly Hills Cop II star says.