If people wore their hair “long” no one would notice that the hairline is changing. The fault lies in modern styles.The most effective treatment is to take a time machine and encourage your father to marry a woman’s whose father never went bald. Another alternative is to wear a hat.
Unlike problems such as getting fat (which you can do something about), there is little one can do. The problem wasn’t so severe in the past since most people died before they went bald – so if one avoids such things as vaccines and antibiotics and surgery that requires anesthetics you are likely to avoid significant hair loss.