1. Heart beats
After age of 20, men’s heart beats during intense exercise keep going down with age. For instance, the heart beats of a 20-year-old man could reach 200 every minute while when he is 30 years old heartbeats will reduce to 140 during the same level of exercises. Then, the age of a male increase each decade, the highest heart beats per minute goes down by 10 times.
2. Muscles and bones
Aging can cause weakness and regressive change on bones and muscle loss
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