Question

Ageing as a process of various detrimental changes within the cells and tissues with advancing age resulting in a rise in the risks of disease and death.

Answer 1

Yaa!

Because due to ageing our inmunity power become week .

And for this there is lot of reason as like bone marrow decrease with ageing so less WBC (white blood cell) means less imunity .

And thymus is also degenrate with aging which is responsible for humoral imunity .

Etc.

For extra information I tell you thymus is a gland situated on the dorsal(back) side of the heart.