Answer:
if they are balding from age, I would recommend a surgical hair transplant, but if you cannot get that find a hair regrowth serum.
if they are balding from diseases, such as Thyroid disease, lupus, and diabetes, I would recommend getting a wig/weave of your choice.
if you are looking to help prevent it, take good care of your hair, don't bleach/dye your hair, avoid heat damage, and look for a hair regrowth serum.