Ryan Phillippe: I Look So Young That People Mistake Me for My Daughter's Brother

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Ryan Phillippe is 40 years old, but you wouldn't know it
just by looking at him.

The seemingly ageless actor recently admitted to Variety that he still gets carded, and
explains why his 15-year-old daughter Ava -- who he had with his ex-wife Reese
Witherspoon -- gets "freaked out" by his good genes.

"It’s crazy," he says about reaching the milestone
age last September. "And still, I get carded constantly. My daughter hates it,
because sometimes people have thought I'm her brother, and she’s freaked out by

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Perhaps that would also explain why he dates women nearly half
his age. Phillippe is currently dating 23-year-old law student Paulina Slagter, and in July of 2011, he welcomed a daughter with then 21-year-old Pitch Perfect actress Alexis Knapp.

The Secrets and Lies
actor is also used to playing roles a lot younger than his actual age -- he was already
in his twenties when he played high schoolers in memorable teen films Cruel Intentions and I Know What You Did Last Summer.

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"That was sort of the end of my innocence," he
says about filming his breakthrough roles. "I made Cruel Intentions when I was 23, and I did I Know What You Did Last Summer when I was 21 or 22, so that was
like the end of my youth, because I went straight into marriage and kids."

As for his thoughts on a remake of 1997's I Know What You Did Last Summer currently in the works,
Phillippe isn't bitter.

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"I think it’s a good idea," he surprisingly says.
"I'm excited about it. It just makes me feel old."

Last October, ET caught up with Phillippe's I Know What You Did Last Summer co-star
Jennifer Love Hewitt, who shared her own thoughts on the remake of the beloved
'90s film.

Watch below!