Photos: Retirees spend their free time graffiti-ing the walls of Lisbon

This ain’t your mother’s street art. It’s your grandmother’s.

A merry band of 65-and-overs have taken to the streets of Lisbon, Portugal, to spray-paint bright murals over city walls. The program is called Lata 65 (which translates to “Can 65,” and is symbolic of the retirement age), a series of workshops run by the community art collective Wool.

The aim is to give participants confidence and a creative outlet. The workshops, begun in 2012, have helped over 100 seniors unlock their inner Banksy. See some of our favorite photos below.

Watch out, Sao Paulo. They’re coming for you next (link in Portuguese).