def is_tachycardic(hr, age):
    """Evaluates if posted heart rate is tachycardic

    Method curated by Braden Garrison

    Tachycardia is defined as a heart rate that is above normal resting
    rate. Specific tachycardic values are dependent upon patient age. More
    info about tachycardia and its diagnosis can be found at:
    https://en.wikipedia.org/wiki/Tachycardia

    Args:
        hr (int): accepts posted heart rate as an int
        age (int): accepts patient age as an int

    Returns:
        str: string describing result - "tachycardic" or "not tachycardic"
    """
    if 1 <= age < 3:
        if hr > 151:
            tach = "tachycardic"
        else:
            tach = "not tachycardic"
    elif 3 <= age < 5:
        if hr > 137:
            tach = "tachycardic"
        else:
            tach = "not tachycardic"
    elif 5 <= age < 8:
        if hr > 133:
            tach = "tachycardic"
        else:
            tach = "not tachycardic"
    elif 8 <= age < 12:
        if hr > 130:
            tach = "tachycardic"
        else:
            tach = "not tachycardic"
    elif 12 <= age < 15:
        if hr > 119:
            tach = "tachycardic"
        else:
            tach = "not tachycardic"
    else:
        if hr > 100:
            tach = "tachycardic"
        else:
            tach = "not tachycardic"
    return tach