User blog comment:B214/Volume 23 discussion blog/@comment-31137559-20170506225314/@comment-31137559-20170507135833

Sirzechs is at least 500 years old based on Lord Gremory's bishop and the evil pieces being created. The devil civil war happened at around that time and it's kind of evident that Sirzechs was at the level of Super Devil diring the civil war. And Souji historically died in 1868. And Sirzechs has been a Satan since the civil war ended. So he has neen that strong for a while.