Can any one tell me what is the speed of life???

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Hey all, I know this is a real strange qus but this is bothereing me since long.I still remember I was a child and day by day I brought up.....when i look back i feel i ran very fast and when I try to look 4-5 years down the line from today it seems a lot of time is there......... This confuses me ........what actualy what is the speed life moves??? I know all of you might have thought of it sometimes.....share your experience....