noun
peak period; pinnacle; prime; zenith; glory days
Refers to the highest point or most flourishing period of something, such as a career, power, or an era.
彼の絶頂期は30代だった。
His peak period was in his thirties.
この文明は絶頂期を迎えた。
This civilization reached its zenith.
最盛期 means 'peak period' or 'height' and is similar to 絶頂期, but 絶頂期 can carry a slightly more dramatic or climactic nuance.
Compound of 絶頂 (ぜっちょう, 'peak, summit') and 期 (き, 'period, time').