New to Coding, help please?!

[sdcaliber]

I am assuming teenage start at 13, right?
do basic arithmetic

teenage_left = 13-x, where x is the user input age
if you want adult
adult_left = 18-x, where x is the user input age

FYI: A lot of coding will involve basic math, so try to
here is an example

user_input = (raw_input("Enter your Age"))
age = int(user_input)
teenage_left = 13-age
if age == 0:
  print "You are a Baby!"
  print "You have", teenage_left, " more years until you are teenager"
elif age == 1 or age == 2:
  print "You are a toddler"
  print "You have", teenage_left, " more years until you are teenager"
elif age == 3 or age == 4:
  print "You are Infant"
  print "You have", teenage_left, " more years until you are teenager"
elif age >= 5 and age <= 12:
  print "You are a Child"
  print "You have", teenage_left, " more years until you are teenager"
else :
  print "Enter a whole number between 0 and 12"

OR ,

you can make it one line at the end, depends on your preference, but I prefer this one, cleaner!

user_input = (raw_input("Enter your Age"))
age = int(user_input)
teenage_left = 13-age
if age == 0:
  print "You are a Baby!"
elif age == 1 or age == 2:
  print "You are a toddler"
elif age == 3 or age == 4:
  print "You are Infant"
elif age >= 5 and age <= 12:
  print "You are a Child"
else :
  print "Enter a whole number between 0 and 12"
print "You have", teenage_left, " more years until you are teenager"