Name:   GoneFishin - Subject:   ChiCom virus infection survival rate by age group Date:   9/25/2020 12:49:52 PM (updated 9/25/2020 12:51:26 PM)

From my limited knowledge, it appears the chart you posted are estimates from early data from China and 6 European countries.

"These estimates are based on age-specific estimates of infection fatality ratios from Hauser, A., Counotte, M.J., Margossian, C.C., Konstantinoudis, G., Low, N., Althaus, C.L. and Riou, J., 2020. Estimation of SARS-CoV-2 mortality during the early stages of an epidemic: a modeling study in Hubei, China, and six regions in Europe."