给定一首诗，移除所有标点符号并将其转换为小写。

When you are old by W.B. Yeats

When you are old and grey and full of sleep,
And nodding by the fire, take down this book,
And slowly read, and dream of the soft look
Your eyes had once, and of their shadows deep;

How many loved your moments of glad grace,
And loved your beauty with love false or true,
But one man loved the pilgrim soul in you,
And loved the sorrows of your changing face;

And bending down beside the glowing bars,
Murmur, a little sadly, how Love fled
And paced upon the mountains overhead
And hid his face amid a crowd of stars.
when you are old by w.b. yeats

when you are old and grey and full of sleep
and nodding by the fire take down this book
and slowly read and dream of the soft look
your eyes had once and of their shadows deep

how many loved your moments of glad grace
and loved your beauty with love false or true
but one man loved the pilgrim soul in you
and loved the sorrows of your changing face

and bending down beside the glowing bars
murmur a little sadly how love fled
and paced upon the mountains overhead
and hid his face amid a crowd of stars