This is the 8960th most frequent Japanese word.
永寿
"永寿" (Eiju) means "eternal longevity" or "long-lasting life."
In this sentence, '永寿' is explained as a concept meaning eternal lifespan.
永寿とは永遠に続く寿命を意味します。
Eiju means a lifespan that lasts forever.
Here, '永寿' is used to describe something the protagonist is seeking or aspiring for.
昔の物語には、永寿を求める主人公がよく登場します。
In old tales, protagonists often appear seeking everlasting life.
In this context, '永寿' represents a desired eternal life, contrasted with choosing a fulfilling life over mere longevity.