Comment by Heavenly pervert demonic rapist on The Max-Level Player’s 100th Regression - Chapter 26

20 rounds = 20 months = 1 year and 10 moths. (1 rounds is equivalent to 1 month)
20 months x 100 = 2,000 months
2,000 months divided by 12 months(1year) = 166 years. So he is 166 years old assuming that he was able to complete 20 rounds each regression..