The above quote is from the book "Somewhere Towards the End" that I am currently reading. It is a memoir by Diana Athill including her experience of growing old. She was born in 1917, worked for the BBC during the Second World War, and after that, helped Andre Deutsch establish his publishing house and worked as an editor. She has written four volumes of memoirs and a novel.
She describes one stage of her life: "Of course you have lost youth, you have moved on and stopped wanting what youth wants." I beg to differ! In my experience, our mirrors tell us that we are no longer young but somewhere deep in our conciousness there is a longing for youth and we never stop "wanting what youth wants." It is just that our bodies age and can no longer meet the demands that youth makes!