NTF3 and Hearing impairment: We show that induction of IHC supporting cell Ntf3 overexpression in 1‐year‐old mice rapidly (within 1 week) increases the amplitude of sound‐evoked cochlear potentials, something that does not occur in young mice, indicating that Ntf3 treatment acutely enhances aspects of cochlear function in middle‐aged mice with mild hearing impairment.