def _is_tachychardic(age: int, heart_rate: int):
    """
    Determines if user is tacahychardic based on age and heart rate. Based on: https://en.wikipedia.org/wiki/Tachycardia
    Args:
        age (int): Age of the user.
        heart_rate (int): Heartrate of the user.

    Returns:
        bool: Whether or not the user is tachychardic .

    """
    if 1 <= age <= 2 and heart_rate > 151:
        return True
    elif 3 <= age <= 4 and heart_rate > 137:
        return True
    elif 5 <= age <= 7 and heart_rate > 133:
        return True
    elif 8 <= age <= 11 and heart_rate > 130:
        return True
    elif 12 <= age <= 15 and heart_rate > 119:
        return True
    elif age > 15 and heart_rate > 100:
        return True
    return False