Final answer:
Hodgkin lymphoma is most commonly diagnosed in individuals between the ages of 20-30 years and 61-70 years, with 75% and 21% of cases respectively in these age brackets. It is a distinct type of lymphoma affecting B or T lymphocytes, differing from the many subtypes of non-Hodgkin lymphoma.
Step-by-step explanation:
Hodgkin lymphoma (HL) tends to affect two primary age groups. According to the data provided, a significant percentage of individuals diagnosed are between the ages of 20 and 30 years, where an estimated 75% of cases are found. Another age group with a notable incidence rate includes those 21% between the ages of 61 and 70 years. While HL can occur at any age, these particular age groups are more commonly affected.
It's important to note that lymphoma, including HL, can develop in B or T lymphocytes. Understanding this aspect of the disease helps in distinguishing HL from the various subtypes of non-Hodgkin lymphoma (NHL). HL is a distinct type of lymphoma in contrast to the over 60 different subtypes of NHL, which can be diagnosed based on the specific cells affected, including B and T cells.