When did the migratory bird-type old-age tourism first come up?

In p>29, Shanyuhai began to explore the migratory bird pension mode in China, and initiated the migratory bird pension mode in China through self-construction, self-management, owner trusteeship and cooperative joining, which organically combined the needs of finance, real estate, pension and leisure vacation.

Migratory birds for the aged is a special life for the aged. Like birds, they choose different regional environments for the aged with the change of climate, that is, they choose different places to travel for the aged with the change of seasons.