This is the 10192nd most frequent Japanese word.
長生
"長生" means "longevity" or "long life."
In this sentence, '長生' is utilized to denote 'longevity', referring to the concept of living a long life.
長生の秘訣は健康的な生活です。
The secret of longevity lies in a healthy lifestyle.
Here, '長生' is used to signify the aspiration for living a long and healthy life.
長生を願って、毎朝神社に参拝します。
I pray for longevity every morning at the shrine.
In this case, '長生' is again associated with the characteristic of being long-lived across generations.