But Twitter clearly has a weakness in the retention and recruitment department: many users aren't staying, and younger users aren't exactly signing on in hordes.

但是Twitter在发掘新人方面显然比较乏力：用户并不是一直都能留住，而且那些年轻人扎堆注册的景象已经不在了。

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Dr van der Horst said further research is needed to find out why women's breasts were staying younger for longer.

BBC: Breast cancer 'is harder to spot'

It says that while many people are living longer and staying in what was once their family home, younger families are being squeezed into smaller properties.

BBC: Charity calls for help freeing up family homes

Yet the best of the group can take advantage of an institutional landscape in the country that often favors older companies over younger ones, helping to boost their growth and staying power.

FORBES: Staying Power: How China's Business Landscape Favors Older Companies