Cindy Crawford is revealing exactly what her 21-year-old daughter, Kaia Gerber, has that she envies.

"I look at my daughter and notice that her hair is shiny and healthy looking — she has my old hair, and I want it back!" the former supermodel shared in an interview with InStyle magazine.

Crawford shares daughter Kaia and 23-year-old son Presley with husband Rande Gerber.

The 56-year-old supermodel went on to share that she was aware of the effects her skin would face with age, but her hair changing as she got older took her by surprise.

kaia gerber with mother cindy crawford

Cindy Crawford is envious of daughter Kaia Gerber's luscious hair. (Miikka Skaffari/Getty Images)

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"Everyone tells you your skin will age, but no one tells you your hair will age, too," she said. "I think we all expect to get gray hair, but I wasn't aware that the texture was going to change, it was going to become more brittle, it was going to shed more and basically just be lackluster."

The legendary model has had her iconic '90s blowout mimicked for several years.

"It's always fun to see trends and styles come back around but updated at the same time," Crawford said of her blowout coming back in style. "It reminds me of all the things about '90s style [that] I loved. There was an unapologetically sexy and fun attitude."

cindy crawford with daughter kaia gerber

Kaia Gerber, 21, is the spitting image of her mother, Cindy Crawford, 56. (Stefanie Keenan/Getty Images for Edward Enninful)

The mother of two said that her bouncy blowout is still one of her favorite looks.

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"To this day, I still like a great blowout with a round brush and then Velcro rollers," Crawford said. "It gives you some volume and soft, shiny waves — I call it the 'Madison Avenue blowout.'"

In November, Crawford said that she hired a coach to help her navigate the stressors in her life.

Cindy Crawford 1990

Cindy Crawford's iconic '90s blowout has come back in style. (Ron Galella Ltd.)

At the time, Cindy laughed with Haute Living magazine when she mentioned she might be "going through a midlife crisis" as she takes on the second half of her 50s.

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"I started working with a coach this year, and one of the things that she speaks to me about is time," Crawford explained to the outlet.

"Like, who am I? I don't know. Maybe I'm just going through a midlife crisis," Crawford added with a laugh.