Born June 19, 2001, Keen Ruffalo is the oldest of the three Ruffalo children. As a kid and teenager, Keen had a couple of cameos in his father's movies: he shows up in 2013's Begin Again and again in an uncredited role in Thor: Ragnarok. Currently, Keen is the only one of Ruffalo's children with an Instagram of his own, occasionally sharing pictures of his travels, his time with friends, and a few sweet (and sometimes snarky) pictures of his family.
Back in 2019, Ruffalo talked to People about what it's like raising three teenagers. "I like those moments where you're just chugging along and then, all of a sudden, your kids open up to you, and you have this deep conversation where they express their troubles — it's hard for them, especially at that age . . . But my kids are way more savvy than I was, man. They're so engaged in the world."