400-500 years now for 2009 duby duby doo wap Phineas and ferb = Candice and perr
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pi is a universal constant which existed long before the first human existed. It existed even before the solar system came into being so there is no person who invented it and so no biography.
The Population Reference Bureau in 2002 estimated that 106,456,367,669 people have existed.
Well, actually age is how many years you've existed independently. So it isn't just a number, but how long you've been able to survive. Think about that and give yourself some approval for living so long. :)
There is no objective proof that God exists, or did exist in the past. However, Christians universally believe that he has always existed and always will.
He read about it. The idea existed long before Pascal Pierre Raymond de Montmort, just named it after Pascal after Pascal used it to solve problems of probability theory.