1. Skin

On the back of your hand, pinch the skin with your index finger and thumb for 5 seconds. Note how many seconds it takes for the fold to smooth out?

1. Up to 5 seconds – your skin is 20 years old;
2. 6–8 seconds - 30 years;
3. 9–12 seconds – 40 years;
4. 13–15 seconds – 50 years;
5. 16–19 seconds – 60 years;
6. More than 19 seconds – 70 and older.

2. Blood vessels and heart

While standing, count your pulse. Then do 20 squats at a fairly quick pace. Count your pulse again and determine by how much it has increased.

1. Up to 10 beats – your cardiovascular system is 20 years old;
2. 10–20 beats – 30 years;
3. 20–30 beats – 40 years;
4. 30–40 beats – 50 years;
5. 40 and more beats – 60 years.
6. Could not complete the squats – 70 and older.

3. Nervous system

Ask someone to hold a regular 50 cm ruler in front of you. It should be positioned vertically with the 0 mark down, held at the other end. Your hand is about 10 cm below the ruler. Your assistant releases the ruler, and you catch it with your thumb and index finger. At what mark did it happen?

1. Up to 20 cm – your nerves are 20 years old;
2. 30 cm – 30 years;
3. 35 cm – 40 years;
4. 40 cm – 50 years;
5. 45 cm – 60 years.
6. Failed to catch it – 70 and older.

4. Muscle strength

Lift your shoulders and shoulder blades off the floor while lying on your back on a hard surface. Lower back pressed to the floor. You can swing your arms and use them or your legs for support. How many times can you do it?

1. 40 times – judging by strength, you are 20 years old;
2. 35 times – 30 years;
3. 28 times – 40 years;
4. 23 times – 50 years;
5. 15 times – 60 years.
6. Less than 12 times – older than 65 years.

5. Ligaments and tendons

Starting position – standing. Bend forward. You can bend your knees. Where can you reach?

1. Place palms on the floor – your ligaments are 20 years old;
2. Touch the floor only with fingers, not reaching with palms – 30 years;
3. Reach with palms to the ankles – 40 years;
4. Place palms below the knees – 50 years;
5. Touch the knees – 60 years;
6. Cannot reach the knees – 70 and older.

6. Respiratory system

Light a candle. From what maximum distance can you blow it out with one breath?

1. 1 meter – your lungs are 20 years old;
2. 80–90 cm – 30 years;
3. 70–80 cm – 40 years;
4. 60–70 cm – 50 years;
5. 50–60 cm – 60 years;
6. Less than 50 cm – 70 and older.

7. Joints and their condition

Put both hands behind your back: one from below, the other over the shoulder. Try to connect your fingers at the level of the shoulder blades. What happened?

1. Easily locked fingers in a `clasp` – your joints are 20 years old;
2. Fingers touched but could not clasp - 30 years;
3. Palms close but fingers do not touch - 40 years;
4. Palms behind back but quite far apart – 50 years;
5. Barely put palms behind back – 60 years;
6. Cannot put both hands behind back – 70 years.

8. Coordination

You will need help from a relative. Take off your shoes, close your eyes, stand on one leg, rest the other foot against the shin of the supporting leg. The assistant times how long you can stand like that.

1. 30 seconds and more – you are 20 years old;
2. 25 seconds – 30 years;
3. 20 seconds – 40 years;
4. 15 seconds – 50 years;
5. 10 and fewer seconds – 60 years.
6. Cannot stand at all – 70 and older.

Now sum up all the results and divide by 8. This average mathematical value is your biological age.
Of course, do not take the results of this test too seriously. Listen to your body and stay healthy!