Where is mistake? About BMi

Question

#Simple calculator BMI (python)
#Underweight < 18.5
#Nornal 18.5 - 24.9
#Overweight 25 - 29.9
#Obesity >30

w = float(input());
h = float(input());
imt = w / (h*h);
if (imt <= 18.5):
print("Underweight");
elif ((imt <= 24.9) and (imt > 18.5)):
print("Normal");
elif ((imt <= 29.9) and (imt >= 25)):
print("Overweight");
elif(imt >= 30):
print("Obesity");

Answer 1

...i think you mostly need age to calculate BMI. and not width and height.

Answer 2

I find mistake.
w = float(input());
h = float(input());
imt = w / (h**2);
if (imt < 18.5):
print("Underweight");
elif(imt >=18.5) and (imt < 25):
print("Normal");
elif(imt >= 25 ) and (imt < 30):
print("Overweight");
elif(imt >=30):
print("Obesity");