Periods of Metal Heroes
This includes adaptations. Showa - 1982 to 1989 (seven years) Heisei XX - 1989 to 2001 (12 years) Heisei XXI - 2001 to 2019 (18 years) Reiwa - 2019 to present (ongoing)
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Periods of Super Sentai
This includes adaptations. Showa - 1975 to 1989 (14 years) Heisei XX - 1989 to 2001 (12 years) Heisei XXI - 2001 to 2019 (18 years) Reiwa - 2019 to present (ongoing)
Periods of Kamen Rider
This includes adaptations. Showa - 1971 to 1989 (18 years) Heisei XX - 1989 to 2001 (12 years) Heisei XXI - 2001 to 2019 (18 years) Reiwa - 2019 to present (ongoing)
Periods of Ultraman
This includes adaptations. Showa - 1966 to 1989 (23 years) Heisei XX - 1989 to 2001 (12 years) Heisei XXI - 2001 to 2019 (18 years) Reiwa - 2019 to present (ongoing)