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The same number of years as right-handed people can live to.
Some people can, but it is very unlikely to live that long
Approximately 6.5-6.6 billion people live on earth
Rome.
Simple. Being born on a leap year on the 29th of February. As the 29th of February only occurs once every four years, you would have to live for 400 years to actually have your 100th birthday.