He died in 1589 at the age of 97, (it is based on the Hojo Godai Ki [Chronicles of the Hojo family through five generations], however, current studied suggest it has many discrepancy between contemporary first class historical materials such as the Myoho-ji Ki [Chronicles of the Myoho-ji Temple] or ancient documents such as old letters, making its credibility doubtful, and Motoki KURODA dated Genan's birth during the Eisho era [1504-1521]. If it is true, his age of death was 10 years younger) one theory has it he was born in 1501.
1589年に死去、享年97となるが、（これは北条五代記の記述によるもので、現在の研究では妙法寺記などの同時代の一級史料や手紙などの古文書などと多くの矛盾が見られることから、その信頼性に疑問が持たれており、黒田基樹は幻庵の生年を永正年間と推定している。これが事実とすれば享年は１０年以上若くなる）一説に1501年生まれという説がある。