The video is a must-see to get the full impact!
The youngest set of twins was 16
Check out some more work by Improv Everywhere:
Implications - In an increasingly vain society, people are constantly stopping to check their reflections and critique the way they appear to the rest of the world. The market for products and technologies that enhance the human ability to see what we look like at any given time is rapidly growing as a result of this movement towards vanity. Further, art projects that comment on this element of vanity are growing in popularity.