age=int(float(input(“how old are you?”)))

if age < 0:
print (“print invalid value”)
elif 4<=age<=11:
print (“you are a child”)
elif 12<=age<=20:
print (“you are a teenager”)
elif 21<=age<=80:
print (“you are an adult”)
elif age >= 81:
print (“you are an elderly”)
else:
print (“invalid value.”)