Physical declines can start in the twenties if people are sedentary, but at any age staying fit can slow these declines. These tests are based on the work of the Cooper Institute. As you continue to exercise, retake these tests. This is a great motivator as you compare your physiological age after exercising for months. Do as may push-ups as you can in 1 minute.
Women can use a modified position with hands and knees touching the floor.
Men, you need to try hands and toes on the floor if you can. The average score for women in their 20's is 26, in their 30's 21, in their 40's 15, in their 50's 13 and over 60 is 8. Do as many sit-ups as you can in 1 minute. Keep your knees bent, feet flat on the floor, arms at your sides and palms down with fingers extended. Curl up only until your shoulder blades lift off the floor letting your fingers slide along the floor for about 3 inches.