Maximum co-ordination of body parts is found at the age of
The control and coordination in human beings take place through the nervous system and hormonal system which is called the endocrine system. ... An effector is a part of the body which responds to a stimulus according to the instructions sent from the nervous system. The muscles and glands are effectors of the body. Maximum coordination of body parts is found in at the age of 20 years.
So, the correct option is ’20 years’.