I still read to 11 y/o dd (and DH) sometimes. I would think all the things we've read over the last year or so would be fine for both a 9 y/o and a 14 y/o,
- Three Men in a Boat and then the sequel Three Men on the Bummel - As the Falcon Her Bells (autobiography of a falconer, lots about the birds then some amusing bits about his life, though not as funny as My Family & Other Animals) - The Gerald Durrell where he goes off as a teenager to work in a zoo, sorry can't recall the name of it - The Shining Levels (chap goes and lives in a hut in the lake district, amongst other things he adopts an orphaned fawn) - A London Child of the 1870s by Molly Hughes (really good read, her family sounds lovely! We also then read A London Girl of the 1880s but beware of A London Home of the 1890s because her baby dies and it is heartwrendingly sad ) Fly by Night by Frances Hardinge and its sequel Twilight Robbery by Frances Hardinge - different in that they are fiction, but they are fabulous to read aloud because of the writing.
I've got lined up to read next Letters from Skokholm which are all about the author's life on the island in the 1920s & the wildlife.