103-year-old Mary Cotter recently decided to show up to her birthday dressed as the superhero she is: Wonder Woman. Cotter celebrated at Montclair Senior Center, where she's been volunteering for the past 25 years. She served coffee, tea, and water to her friends, insisting to be the host rather than be doted on:

They call me the barmaid because I'm serving drinks.

Using the word "barmaid" is about the only thing that indicates Mary is a centenarian. She lives alone and drives herself back and forth to the center, where she volunteers five days a week. Prior to donating much of her time at the senior center, she volunteered rescuing sea turtles well into her 90s. 

Sources: ABC7 News