Ageing is a natural process. You cannot deny it. Once you start growing, your body undergoes a lot of physical and mental changes. Grey hair, wrinkles, shrinking of bones, reducing the elasticity of the skin, etc are all signs of ageing. These changes are the result of various biological and environmental changes that cause your health to deteriorate. Some of the changes are caused by your body as it grows older. For instance, the stage of adolescence and puberty is reached when a person is in his teenage. Other changes like damaged skin or sometimes grey hair are the consequences of your exposure to the sun. That is ageing is caused due to the changes that take place in the body and how you respond to the environmental changes that affect your body.