If I ask your age you might say 15 year 20 year or 50 year but do you know it is not the age of you.Seriously I am not joking.You are way much older than you think.I will explain that to you in a moment.
The age of earth is 4.543 billion years so all matters that are present in the earth today is 4.543 billion yrs old.If we consider no particle has comes to the earth after the creation of earth then all particle in the earth remains constant but only it's shape and forms are changed.So each particle of your body with which your body is built is also 4.543 billion year old so your actual age is roughly about 4.543 billion year.And that age what you know is the age of you in human form.If we take the creation of universe through which the universe and all matters are created then your age might be a 100 billion year old.
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