List of Famous people who are 55

Sean Michael Carroll is a theoretical physicist specializing in quantum mechanics, gravity, and cosmology. He is a research professor in the Walter Burke Institute for Theoretical Physics in the California Institute of Technology (Caltech) Department of Physics and an External Professor at the Santa Fe Institute. He has been a contributor to the physics blog Cosmic Variance, and has published in scientific journals such as Nature as well as other publications, including The New York Times, Sky & Telescope, and New Scientist.

Bryna Rebekah Kra is an American mathematician who works in dynamical systems and ergodic theory, and uses dynamical methods to address problems in number theory and combinatorics. She has made contributions to the structure theory of characteristic factors for multiple ergodic averages.