This project is important to the VA health care system because 38% of American veterans are aged (age > 65 years), bioavailable testosterone is diminished in older age men, low testosterone is associated with impaired muscle strength, and lack of muscle strength hinders rehabilitation. Older men who are not successfully rehabilitated often get admitted to nursing homes for long term care, at a cost of approximately $40,000/year. Payment for long term care is currently one of our most difficult health care problems. If testosterone supplementation improves rehabilitation outcomes, as our pilot data suggest it will, patients will be more satisfied and long-term care financial resources will be saved.