Python Syntax: Medical Insurance Project ~ Code Review

Requesting please if someone would be so kind as to review my cod for this initial project, thank you everyone in advance for your help.

# create the initial variables below

age = 28

sex = 0

bmi = 26.2

num_of_children = 3

smoker = 0

# Add insurance estimate formula below

insurance_cost = 250 * age - 128 * sex + 370 * bmi + 425 * num_of_children + 24000 * smoker - 12500

print("This person's insurance cost is " + str(insurance_cost) + " dollars.")

# Age Factor

age += 4

new_insurance_cost = 250 * age - 128 * sex + 370 * bmi + 425 * num_of_children + 24000 * smoker - 12500

change_in_insurance_cost = new_insurance_cost - insurance_cost

print("The change in cost of insurance after increasing the age by 4 years is " + str(change_in_insurance_cost) + " dollars.")

# BMI Factor

age = 28

bmi += 3.1

new_insurance_cost = 250 * age - 128 * sex + 370 * bmi + 425 * num_of_children + 24000 * smoker - 12500

change_in_insurance_cost = new_insurance_cost - insurance_cost

print("The change in cost of insurance after increasing the bmi by 3.1 is " + str(change_in_insurance_cost) + " dollars.")

# Male vs. Female Factor

bmi = 26.2

sex = 1

new_insurance_cost = 250 * age - 128 * sex + 370 * bmi + 425 * num_of_children + 24000 * smoker - 12500

change_in_insurance_cost = new_insurance_cost - insurance_cost

print("The change in cost of insurance for being male instead of female is " + str(change_in_insurance_cost) + " dollars.")

# Extra Practice

sex = 0 

num_of_children -= 3

new_insurance_cost = 250 * age - 128 * sex + 370 * bmi + 425 * num_of_children + 24000 * smoker - 12500

change_in_insurance_cost = new_insurance_cost - insurance_cost

print("The change in cost of insurance for having no children is " + str(change_in_insurance_cost) + " dollars.")

num_of_children = 3

smoker = 1

new_insurance_cost = 250 * age - 128 * sex + 370 * bmi + 425 * num_of_children + 24000 * smoker - 12500

change_in_insurance_cost = new_insurance_cost - insurance_cost

print("The change in cost of insurance for being a smoker is " + str(change_in_insurance_cost) + " dollars.")