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Meanwhile, the extra 70-84 years people increased denominator of 90+ rate and centenarian rate, then 90+ rate and centenarian rate in higher income region will be fall behind. 10-20 years later, benefited from additional 70-84 years population, the number of 90+ will be largely increased. 20-30 years later, the number of 100+ will be largely increased too. Income is positively related with lower mortality rate of oldest-old and higher 90+ rate and centenarian rate, although the effect will be lagged for 10-20 years and 20-30 years, res