old lady - mobile

two questions came to his mind:

1. she must be more than 80 years old - how does she keep so fit to still work at her age?

2. why she has to work at her age? has she got a family to support her? or she just wants to work to keep herself occupied?

he met this old lady at the exit hall of the yinzi cave collecting empty bottles yesterday, and now she's at the guilin seven star park separated by a distance of 60 miles from lipu(yinzi cave), collecting empty bottles. he gave her a couple of rmb's both occasions.

- she's obviously a very happy old lady. happiness is to be able to do whatever that can keep one occupied till death comes.

also happiness = mobility