Body Age Calculator

def calculate_body_age(
    chronological_age: int,
    bmi: float,
    systolic_bp: int,
    resting_hr: int,
    weekly_exercise_hours: float,
    smoking: bool,
    sleep_hours: float,
    stress_level: int  # 1-10
) -> dict:
    """
    Estimate biological age based on lifestyle factors.
    Returns body age and adjustments.
    """
    body_age = chronological_age
    adjustments = []

    # BMI impact (optimal 18.5-24.9)
    if bmi < 18.5:
        body_age += 1
        adjustments.append("Underweight (+1 year)")
    elif 25 <= bmi < 30:
        body_age += 2
        adjustments.append("Overweight (+2 years)")
    elif bmi >= 30:
        body_age += 5
        adjustments.append("Obese (+5 years)")

    # Blood pressure (optimal < 120/80)
    if systolic_bp >= 140:
        body_age += 5
        adjustments.append("High blood pressure (+5 years)")
    elif systolic_bp >= 120:
        body_age += 2
        adjustments.append("Elevated BP (+2 years)")

    # Resting heart rate (optimal 50-70)
    if resting_hr < 60:
        body_age -= 2
        adjustments.append("Low resting HR (-2 years)")
    elif resting_hr > 90:
        body_age += 4
        adjustments.append("High resting HR (+4 years)")
    elif resting_hr > 75:
        body_age += 2
        adjustments.append("Slightly high HR (+2 years)")

    # Exercise (optimal 5+ hours/week)
    if weekly_exercise_hours >= 5:
        body_age -= 4
        adjustments.append("Active lifestyle (-4 years)")
    elif weekly_exercise_hours >= 2.5:
        body_age -= 2
        adjustments.append("Moderate exercise (-2 years)")
    elif weekly_exercise_hours < 1:
        body_age += 3
        adjustments.append("Sedentary (+3 years)")

    # Smoking
    if smoking:
        body_age += 8
        adjustments.append("Smoking (+8 years)")

    # Sleep (optimal 7-9 hours)
    if sleep_hours < 6 or sleep_hours > 9:
        body_age += 2
        adjustments.append("Poor sleep (+2 years)")

    # Stress (optimal 1-3)
    if stress_level >= 7:
        body_age += 3
        adjustments.append("High stress (+3 years)")
    elif stress_level >= 5:
        body_age += 1
        adjustments.append("Moderate stress (+1 year)")

    return {
        "chronological_age": chronological_age,
        "body_age": max(chronological_age - 15, body_age),
        "difference": body_age - chronological_age,
        "adjustments": adjustments
    }

result = calculate_body_age(
    chronological_age=35, bmi=22.5, systolic_bp=115,
    resting_hr=62, weekly_exercise_hours=4, smoking=False,
    sleep_hours=7.5, stress_level=4
)
print(f"Chronological age: {result['chronological_age']}")
print(f"Body age: {result['body_age']}")
print(f"Difference: {result['difference']:+d} years")