This health product claims to extend your lifespan.
Tips
history
From Song Yu's《高唐赋》(Warring States, Chu): 延年益寿千万岁 — wishing the king ten thousand years of extended life. The phrase has stayed in the language as a stock blessing.
register
Common in advertising for health products and traditional medicine. Also used as a polite wish to elders. Sounds slightly old-fashioned in casual speech.
