Dr. Tirgan has pioneered the research in documenting the age of onset of keloid disorder, i.e. the age when individuals develop their very first keloid. The graph below depicts the age at which patients presented for the first time to Dr. Tirgan. This is among 1007 cases. 

The following graph depicts the age of onset among 980 seen by Dr. Tirgan in his keloid specialty medical practice. The peak age of onset is 17 for females and 21 for male patients.