Final answer:
The approximate guideline duration of a workout program for an older adult is at least 150 minutes (2.5 hours) to 300 minutes (5 hours) per week of moderate-intensity aerobic activity.
Step-by-step explanation:
The approximate guideline duration of a workout program for an older adult can vary depending on the intensity and type of exercise. According to the U.S. Department of Health and Human Services (HHS), adults should aim for at least 150 minutes (2.5 hours) to 300 minutes (5 hours) per week of moderate-intensity aerobic activity, or 75 minutes (1.25 hours) to 150 minutes (2.5 hours) per week of vigorous-intensity aerobic activity. This can be spread throughout the week. Additionally, adults should also engage in muscle-strengthening activities on 2 or more days per week.