Do you want to live to be 100? Living to 100, once a rarity in the U.S., is on the rise. Centenarians now number around 82,000, up from 50,000 in 2002, according to census figures; those 100-plus are the country’s second-fastest growing age group, just after those 85 and older. In the next decade, the number of centenarians is expected to rise to about 140,000. Researchers think we can live even longer: While average life expectancy for men is 76 and women is 81, the limit of human life is widely set at 122, the reported age of Jeanne Calment, who died in 1997.