Juanjo Albizu is sporting a baseball cap, a T-shirt tucked neatly into his sweatpants and elbow pads as he positions his skateboard at the bowl's edge.
The octogenarian grins mischievously, ready for the "drop," as other skaters, clad in baggy streetwear, crane their necks while the sun casts long shadows over the graffiti-covered concrete skate park in northern Spain.
