Humans Middle Aged female human 289 Female 285 adult 263 Male 257 male 253 Adult 219 article 213 controlled study 177 priority journal 166 aged 145 Aged 143 middle aged 140 major clinical study 103 clinical article 84 Adolescent 77 Argentina 66 adolescent 55 Article 54 Young Adult 46 Child 39 child 34 genetics 34 human cell 32 Aged, 80 and over 31 human tissue 31 metabolism 30 physiology 30