This is an exploratory analysis that is investigating the pattern of care in patients over the age of 80 who were diagnosed with non-Hodgkin lymphoma (NHL). This study will look at the dose intensity and density implemented in this patient population to calculate whether patients received the full course of therapy, received less duration of treatment, or received lower doses of the drugs administered. Furthermore, the investigators would explore time to disease progression for these patients regardless of the treatment received and investigate whether patient outcomes differ based on the type of therapy or dose intensity/density given.