Shenzhen, China recently debuted a new system that ch allows people over the age of 60 to register for free subway rides, using their face as their ticket.

It is also being experimented with in other cities including Jinan, Shanghai and Nanjing according to the South China Morning Post.

For now, says the report, "the service is only available at the 18 stations on Line 11, and involves 28 automatic gate machines and 60 self-service ticket processors."