Age for advanced balding

 I see you mention several times in your posts that usually people who inherit the genes for MPB typically start showing signs of hair loss by 30. And for those who are destined for advanced Norwood 6/7 patterns, the pattern is usually already established/ complete by the time they are late 20’s. Those who don’t begin balding until after 30 usually develop less severe patterns like a Norwood 3. On the other hand however, I’ve seen several posts where the writer and/ or you gave examples of people who developed balding later in life and some of it to an advanced degree. What accounts for this seemingly conflicting information? Did many of those people likely already have miniaturization starting in their 20’s, but it was just never noticed and as it progressed with the age, the hairloss finally started to become evident?

Specific patients will start balding at any age making it difficult to draw conclusions on any single individual.  Norwood recognized this so he looked at large populations and recorded the incidence of each pattern with respective ages.  That showed most of the advanced balding patterns like the Class 7 pattern men by the age of 30.  I have seen many men who started balding late in life (30s or 40s and even 50s), but those men were more exceptions to the general population statistics. If you are looking for rules to let you know where your balding pattern will go, forget the Norwood statistics and evaluate your pattern by miniaturization and your detectable hair loss