Parallel threats have sent San Francisco's nightlife into a tailspin: The city is aging, making its economy increasingly dependent on older people. And 20-somethings aren't filling the gap.

Late-night teahouses have opened up around L.A. to serve a younger population who is drinking less. Some reference East Asian tea ceremony culture, others lean bohemian.

Anti-social behaviour is among the leading problems holding back the drive to improve Peterborough’s night-time economy, it has been claimedBusiness owners and civic leaders say that concerns around ...