Hair loss rarely comes out of nowhere. It is usually a gradual process in which hairs return a little shorter, thinner, and finer after each growth cycle. The predisposition is often hereditary, but it does not follow a single simple pattern. This raises questions: who do you inherit baldness from, can you go bald if your father isn't, and when does it settle down? Understanding what happens in the scalp and how genes and hormones influence each other generally makes it easier to predict how the process will unfold.
What happens in your hair follicle: from growth cycle to miniaturisation
Every hair follicle goes through a cycle with a growth phase (anagen), a transitional phase, and a resting phase (telogen). With hereditary hair loss, the growth phase in particular becomes shorter. The hair therefore has less time to grow thick and long, causing it to return slightly finer after each cycle. This process is called miniaturisation: strong, terminal hairs gradually transform into thin vellus hairs. You often first notice reduced density at the temples and crown, while the sides remain relatively unaffected. This pattern is consistent with androgenetic alopecia, the most common form of baldness in men, although miniaturisation also plays an important role in many women.
DHT and sensitivity: why not everyone with the same hormones goes bald
In the scalp, testosterone is partly converted into DHT (dihydrotestosterone) by the enzyme 5-alpha-reductase. DHT is not inherently 'bad'; the difference lies mainly in the sensitivity of certain follicles to this hormone. In people with a predisposition, those follicles react more strongly to DHT, causing the growth phase to shorten faster and miniaturisation to occur sooner and more rapidly. This is why one person with normal hormone levels can still quickly develop thinner hair, while another with comparable levels barely experiences any hair loss. It also explains why hair loss often progresses in phases: a period of acceleration can be followed by quieter years, while the underlying predisposition remains.
Who do you inherit baldness from? It is usually a combination of genes
There is no simple answer to the question of who you inherit baldness from. Androgenetic hair loss is polygenic: multiple genes contribute, each with a relatively small effect. Part of the sensitivity is linked to the androgen receptor, which is located on the X chromosome. This quickly gives rise to the idea that you should mainly look at your mother's family. In practice, however, the predisposition comes from both sides. You can therefore inherit traits from both your mother's and your father's lineage. Even when baldness is not clearly visible in close relatives, the combination of genes you carry can still be unfavourable. Age also plays a role: some relatives appear 'not bald' but simply have a later onset or a milder progression.
Can you go bald if your father isn't? Yes, and these are the most logical explanations
A father with a full head of hair does not rule out hereditary hair loss. First, your genetic combination can differ from your father's because you do not inherit one 'baldness gene' but a mix of several. Second, baldness within a family may go unnoticed because it only becomes visible at an older age, or because someone camouflages thinning hair with a particular hairstyle. Additionally, factors on top of the predisposition can accelerate hair loss, such as prolonged stress, nutritional deficiencies, thyroid problems, or certain medications. These causes do not always produce the same classic miniaturisation pattern, but they can speed up or worsen the overall picture. If you are unsure, it is wise to have it assessed whether you are dealing with hereditary hair loss or a (partially) temporary form, as the approach often differs.
At what age does baldness stop? Stabilisation is possible, but 'stopping' is not always realistic
Many people notice the first signs between their late teens and mid-thirties, although it can also start later. The rate varies widely: in some people it stabilises after a few years, while in others it gradually continues into older age. The question of when baldness stops therefore usually comes down to the point at which the process slows. Aggressiveness often decreases over time, but without treatment, sensitive follicles remain sensitive in principle. Timing therefore matters: waiting too long can mean losing follicles that can no longer produce strong hairs. When the donor area is sufficient and the pattern is suitable, a hair transplant can provide a lasting cosmetic improvement, because transplanted hairs typically come from a more DHT-resistant area. A realistic assessment of stability and future progression remains essential in all of this.
Hereditary hair loss results from an interplay of the hair growth cycle, DHT sensitivity, and a combination of genes that you can inherit from both parents. This means you can go bald even if your father isn't, and 'stopping' usually means a gradual stabilisation rather than a fixed end age. Those who understand in time which type of hair loss is at play, and how the pattern is likely to develop, can make more targeted decisions about monitoring, treatment, and possible restoration options.