"Huanian" is a Chinese word, which comes from Biography of Wei Shu Wang Zuo and Jin Se by Tang Li Shangyin. The word with the opposite meaning of "Huanian" is "old age".
"Hua nian" is a general term for age in ancient times. The age of ancient people is sometimes expressed by other terms instead of numbers. Age appellation is mostly recorded in books, and then it has been used to this day. For example: octopod, cardamom, weak crown, total angle, weeping and so on.