human 123 middle aged adult 118 Humans 117 female 113 male 111 Middle Aged 105 Female 100 Male 96 Adult 93 Article 57 aged 52 perception 48 controlled study 47 Aged 45 psychology 45 young adult 43 Young Adult 41 physiology 40 clinical article 34 article 33 adolescent 31 Adolescent 30 major clinical study 30 speech perception 25 Speech Perception 24 pathophysiology 24 questionnaire 23 human experiment 22 hearing 18