White hair reminds you that time has finally caught up with you

For children, childhood is timeless. It is always the present. Everything is in the present tense. Of course, they have memories. Of course, time shifts a little for them and Christmas comes round in the end. But they don’t feel it. Today is what they feel, and when they say ‘When I grow up,’ there is always an edge of disbelief—how could they ever be other than what they are?

You don't have time, Len. That is the most bitter and the most beautiful piece of advice I can offer. If you don't have what you want now, you don't have what you want.

Time does not pass, it continues

We cannot know what time will do to us with its fine, indistinguishable layers upon layers, we cannot know what it might make of us. It advances stealthily, day by day and hour by hour and step by poisoned step, never drawing attention to its surreptitious labours, so respectful and considerate that it never once gives us a sudden prod or a nasty fright. Every morning, it turns up with its soothing, invariable face and tells us exactly the opposite of what is actually happening: that everything is fine and nothing has changed, that everything is just as it was yesterday--the balance of power--that nothing has been gained and nothing lost, that our face is the same, as is our hair and our shape, that the person who hated us continues to hate us and the person who loved us continues to love us.

Nothing is as misleading as time – just think about it and you've already gotten old.