While this is presented as a biography of Charles Babbage and Ada Lovelace, his professional partner and collaborator, it's mostly about Babbage. One gets pretty far in before there's much about Ada Lovelace.
It's true that there was a considerable difference in their ages, and they met when he was a widower in his thirties and she was nineteen. By the time he met Ada Byron, later Ada Lovelace, he had built a working 1/7 prototype of the Difference Engine. After they met, they quickly became friends, based in their shared love of science and mathematics, and more gradually, dedicated professional partners. Ada Lovelace became an essential part of his work on the Difference Engine 2 and the Analytical Engine. But really, this book is mostly about Charles Babbage.
That said, it's a very interesting account of both the roots and the development of Babbage's ideas, including the seemingly unexpected role played by advances in weaving, most importantly, the development of the Jacquard loom, producing intricate and beautiful designs by means of punchcards.
