Working Age
In Europe, most people retire around the age of 60, and the majority by the age of 70. Given that, it is rare that you will see someone of advanced age working at a place like a supermarket. Any European going into a place of business and seeing an older adult is likely to be very surprised.
While some are working because they need the money, others do it to get out in the world and to have a more fulfilling purpose each day. Especially now with the sharing economy (Uber, anyone?), more and more older adults are finding new ways to get back out there.