Born in Wentworth, Langhorne was the son of Reverend John Langhorne, and Frances Annesley Yorke and was educated at Marlborough College, Wiltshire, England. His siblings were Charles Edward C. J. Langhorne (1873–?), Ursula Vansittart H. Langhorne (1874–?), Herbert Yorke Langhorne (1877–?), and James Archibald Dunboyne Langhorne (1879–1950). Brigadier-General Harold Stephen Langhorne was his half brother.
