I assume by “alive” you “existed” unless you consider the universe to be an organism? Most scientists agree that the universe is around 13750000000 (13.75 billion) years old.
It all started with a big bang (http://www.youtube.com/watch?v=lhTSfOZUNLo) and by measuring (among other things) the leftover heat from this bang we can get the cooling time since the bang, the age of the universe.
Yes, according to the recent estimates the Big Bang, which is thought to be the beginning of the universe as we know it, occured around 13,75 billion years ago. But Cees has already said it more eloquently.
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