Photo Credits
three-boys
from Shutterstock.com used under Royalty Free
two-girls
from Shutterstock.com used under Royalty Free
girls
from Shutterstock.com used under Royalty Free
nation-people-am
from Aleph with Beth used under Creative Commons BY-SA 3.
old-man
from Shutterstock.com used under Royalty Free
old-men
from Shutterstock.com used under Royalty Free
boy
from Shutterstock.com used under Royalty Free
boys
from Aleph with Beth used under Creative Commons BY-SA 3.
girl
by Claudiovidri / from Shutterstock.com used under Editorial
dog-celev
from Shutterstock.com used under Royalty Free
dogs-on-house
from Shutterstock.com used under Royalty Free
face
from Wikipedia Commons used under CC BY-SA 3.0