About 50% of men and 25% of women inherit a particular gene from their parents that makes them sensitive to DHT. This sensitivity varies in age from when it starts to affect you, however once it does your hair will start to miniaturize and you will gradually bald over about 15 years. Once it starts you will lose about 10 hairs per day permanently so its a good idea to see a hair loss specialist as soon as you can. A good hair loss specialist will be able to review your bloodwork and scalp microscopically to determine whether you have inherited the baldness gene or not.
Balding can be inherited from any person in the family on either side and the balding genes can be seen multiple generations back may not have expressed itself despite being passed down through a generation or more