Happy Wheels roller skating rink on Warren Avenue in Portland celebrated its 40th birthday Sunday with an afternoon of free skating.

Shelves of rental roller skates line a wall at Happy Wheels. John Ewing/Staff Photographer

Melissa Emmons of Hollis brought her niece, Ella Coney, 3, to the rink to try roller skating for the first time. John Ewing/Staff Photographer

Happy Wheels welcomed skaters of all ages Sunday to celebrate its 40th anniversary. John Ewing/Staff Photographer

Jaime Small laces up skates for her son, Benjamin, while other family members Mason Small, left, and Madeline LeDoux, right, lace up their skates. The Small family traveled from Sanford to take advantage of free skating at the rink. John Ewing/Staff Photographer