Hong Kong is one of the world's richest cities, so why are thousands of elderly residents collecting rubbish to survive?

Office workers rush past, oblivious to the army of grey-haired residents toiling in the shadows of Hong Kong's soaring skyscrapers.

Dragging trolleys laden with waste, they sell whatever they can collect for just a few dollars.

Hong Kong is home to 64 billionaires and has the highest number of Rolls-Royces per capita in the world.

But one in three elderly people lives in poverty - one of the highest senior poverty rates in the developed world.

And with a rapidly ageing population, Hong Kong could soon face a "silver tsunami".

101 East asks why so many elderly residents are struggling to survive in one of the world's richest cities.

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Source: Al Jazeera