Claim: Karen Barad (age 64) has their doctorate, and is the author of Meeting the Universe Halfway: Quantum Physics and the Entanglement of Matter and Meaning.
Evidence: Karen Michelle Barad (/bəˈrɑːd/; born 29 April 1956) is an American feminist theorist, known particularly for their theory of agential realism. Barad earned their doctorate in theoretical physics at Stony Brook University. They are the author of Meeting the Universe Halfway: Quantum Physics and the Entanglement of Matter and Meaning. 
Karen Michelle Barad
(1956-04-29) 29 April 1956 (age 64) Meeting the Universe Halfway: Quantum Physics and the Entanglement of Matter and Meaning Barad earned their doctorate in theoretical physics at Stony Brook University.