Updated project metadata. The skeletal muscle proteomics study of vastus lateralis muscle biopsies which were collected from participants from the Genetic and Epigenetic Study of Aging and Laboratory Testing (GESTALT). The participants were free of major diseases, except for controlled hypertension or a history of cancer that had been clinically silent for at least 10 years, were not chronically medicated (except one on antihypertensive medication), had no physical or cognitive impairments, had a BMI less than 30 kg/m2, and were not professional athletes.