Jack Antonoff is desperate for babies with Lena Dunham

Jack Antonoff is 30 and ready to be a dad, but is his girlfriend Lena Dunham on board?

Jack Antonoff is ready for babies. The fun. guitarist just hit 30, and can hear his biological clock ticking. He opened up to New York Magazine about his hope for children, and how his girlfriend Lena Dunham might figure into that.

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The couple has been dating since 2012 — the result of a blind date set up by comedian Mike Birbiglia. Antonoff said he knew right away that Dunham was a match for him.

“I told Lena everything about my whole life, because when you really like someone, you want them to know everything about you,” he said.

The musician, whose high school sweetheart was Scarlett Johansson, admitted that he and Dunham have talked about marriage, but knows they are far off from actually tying the knot. He explained, “I think all people in relationships that last longer than a year start talking about that stuff. It’s hard to imagine when the right time is because things are so crazy at the moment.”

That craziness includes not only Dunham’s show Girls, but also Antonoff’s band fun. as well as his new project Bleachers. The couple have never hidden their relationship, and often post photos of their adventures on Instagram.

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But Antonoff did admit he is “desperate” to have kids, and knows his age has a lot to do with it.

“I think it’s biological,” he explained. “I’m 30. I’m not that young, right? I’m not, like, 24 or 22. I’m no longer in the phase of my life where I talk about everything as in the future. Like, I’m in the future.”

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Antonoff seems very much in awe of his girlfriend, and also admitted that he hopes it’s Dunham who helps him with his new goal.

“It just seems like the most fun thing in the world,” he said. “I’ve never met people who have kids who haven’t looked me in the eye and been like, ‘It’s the greatest thing that’s ever happened.'”