What is the typical age range for the onset of Henoch-Schonlein purpura?

The typical age range for the onset of Henoch-Schonlein purpura (HSP) is indeed between 5 to 15 years. This condition is primarily seen in children and is characterized by a small-vessel vasculitis that often presents with symptoms such as a palpable purpura, typically on the buttocks and legs, abdominal pain, arthralgia, and renal involvement.

HSP is particularly common in this age group, with most cases occurring in school-aged children. The condition is associated with a preceding upper respiratory tract infection, often viral, which is more prevalent in this age range. The diagnosis is based on clinical findings, and the disease is generally self-limiting, with most children recovering fully without long-term complications.

Other age ranges provided do not align with the known epidemiology of HSP, as it is rarely diagnosed in infancy, uncommon in young adults, and even less so in older adults. Thus, the 5 to 15 years range accurately reflects the demographic most affected by this condition.