Bob,
Your information is WRONG.
Castration stops further baldness.
People who get castrated before they start to lose hair, DONT LOSE HAIR. That website, like alot of bullshiit websites, is WRONG.
Women who get testosterone injections to be "like men" end up going male pattern bald about as often as men do. 50% of women who got testosterone injections were at various states of Norwood level 2-5 at 13 years of testosterone treatment.
Finasteride, the weakest internal anti-androgen we have, only stops 90% of type 2 created DHT, and leads to increased hair counts that peak at year 2, and slowly decline thereafter. A person does not get back to baseline until roughly years 12-14 on finasteride alone according to Ken Washenik, a relatively famous hair researcher. Dutasteride is roughly 22% more effective than finasteride is, so the curve to get back to baseline would be longer, probably a good 20 years or so.
I get sick and tired of people who read some bullshiit website coming in here and declaring that all science has discovered about baldness is wrong and that there is "something in the air" or some such horseshit that causes baldness, that shampoo causes baldness (then everybody would be bald---beacause we all wash our hair), big pillows cause baldness, cell phones cause baldness.
Roman emporers (Julius Ceasar) went bald. Ive seen a Cretian vase depicting a bald (Norwood 6-7) fisherman from 1500 BC. Thats a long time before power lines. Ancient Egyptians attempted to fight baldness with crocidile fat and hippo dung, Ancient greeks had their own concoctions and Hippocrates used pigeon shiit to fight his own baldness (didn't work either). Male horomone, espeically DHT, made right there in the outer rootsheath of the hair follicles where the type two alpha five reductase enzymes are located get uptaken by androgen receptors, and the DNA instructs in the dermal papilla submit growth inhibitors like thrombospondin, fiberbalst growth factor five, tgf-beta, interleuikin 1, and some others yet to be discovered to the rest of the follicle. Follicle cells in the root sheath, kerationocytes, epilitheal cells, etc. slow down production and slow hair growth. At some point, the immune system (probably sensing more growth inhibitors being active in a mini-organ than growth factors) senses the follicle is a foreign body and begins to attack it. Excessive collagen gets deposited around the follicle by the dermal fibrobalsts (probably as a result of tgf-beta whcih you can counteract with apple proanthocyandins, green tea extract, or curcumin, or bromelain) which constrict the microcapillaries that feed the follicle, the immune system sends superoxides at the follicle which age it, and inflammatory cytokines like TNF-alpha, protien kinease C, and IL-1 and the ageing and damage begins.
Its easy to stop this however, just block receptor sites on the follicle, as the follicles on your head need no male hormone at all. If you are interested in regrowing some hair, block receptor sites and use growth stimulants and tissue remodellers to repair cellular damage and attempt to break up the collagen. Thats it. Not goddammned light poles.