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With a 1% prevalence rate, 2.5 million people in the U.S. may have trichotillomania at some time during their lifetimes. [ 50 ] Trichotillomania is diagnosed in all age groups; onset is more common during preadolescence and young adulthood, with mean age of onset between 9 and 13 years of age, [ 10 ] and a notable peak at 12–13. [ 9 ]
Inherited eyelash problems are common in some breeds of dogs as well as horses. Eyelashes are an uncommon but not unknown feature in birds. Hornbills have prominent eyelashes (vestigial feathers with no barbs), as do ostriches. Amongst the reptiles, only Eyelash vipers show a set of modified scales over the eyes which look much like eyelashes.