May 19, 2015 01:00 PM

Drew Barrymore‘s daughter Olive may look just like her mama, but the actress is quickly discovering that their personalities are completely polar-opposites.

“I don’t know exactly who she is, but it’s just fascinating to find out who your children are,” Barrymore said during a Tuesday appearance on The Ellen DeGeneres Show. “If you say, ‘Hi, Olive,’ she’s like [straight face].”

But the 2½ year old‘s younger sister seems to follow in her mother’s footsteps. “Frankie is just so happy all the time, it’s ridiculous,” Barrymore says of her 12-month-old daughter.

Michael Rozman/Warner Bros

And these days, the mom of two — who wed Will Kopelman in June 2012 — has reached her own sense of happiness.

“When I was a kid, I felt like I should be older because I was working and not really being a kid,” she explains. “Then when I was in my 20s, I was like, ‘I want to be a kid finally.’ “

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Celebrating the recent major milestone of her 40th birthday in February finally allowed the Flower Beauty cosmetics founder to feel at peace with her place.

“Now, it’s the first time in my life that my age has met up with where my life is, and it’s perfect. I love being 40,” Barrymore says. “I always felt not my age and now I feel my age and I love it. It feels comfortable.”

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— Anya Leon

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