Unraveling the mystery of frailty.
D000368:Aged; D000369:Aged, 80 and over; D015444:Exercise; D005221:Fatigue; D005260:Female; D016330:Frail Elderly; D006801:Humans; D008297:Male; D018908:Muscle Weakness / Q000150:complications / Q000517:prevention & control; D009752:Nutritional Status; D010641:Phenotype; D015431:Weight Loss