Final answer:
Noah Webster, a Yale grad, published "An American Dictionary of the English Language" in 1828 when he was 70. His dictionary was a significant contribution to the development of American English.
Step-by-step explanation:
The Yale grad who put out "An American Dictionary of the English Language" in 1828 when he was 70 is Noah Webster.
Webster was a prominent lexicographer and his dictionary became a significant milestone in the development of American English. He aimed to standardize American spelling and pronunciation, distinguishing it from British English.