I went ahead and counted how many times Captain Jack and Diana Villiers are described as "boyish," "boylike," "like a great boy," and "bounding up the steps like a boy" in Patrick O'Brian's Aubrey-Maturin series. It's a lot!
https://www.thechatner.com/p/who-is-more-like-a-boy-in-the-aubrey
https://www.thechatner.com/p/who-is-more-like-a-boy-in-the-aubrey
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