Yes, Kallman's is lifelong anosmia . Failure of olfactory nn to migrate or something; had a woman with amenorrhea with that dx.
But most common reasons to have anosmia are:
badass chronic sinusitis (R/0 with neg sinus CT)
or
MVA, shears off the olf neurons at cribiform plate; I did a depostion for a pt with this complication; I always wondered if they were actually compensated in any way for that. I suppose if you really love the smell of coffee, pizza, or napalm in the morning.