Why is the last stage called the second childhood in the poem 'All the world's a stage'?

According to the poet, every man has 7 stages during his life time. These lines describe the last stage of a man's life. When a man grows old, slowly he loses his senses of sight, hearing, smell & taste like the child. So this stage of his life is considered as second childhood.

Hope it helps:D

the answer is b

conversing outside - a.