In which situation does retinoblastoma most commonly occur?

Retinoblastoma is a type of eye cancer that primarily affects young children, particularly those under the age of five. The most common age of diagnosis for this cancer is around two years old. This timing correlates with the developmental stages of children, where their rapidly growing cells may become more susceptible to mutations that lead to cancer.

In contrast, the other groups listed—elderly patients, teenagers, and pregnant women—are not typically associated with this specific type of cancer. Retinoblastoma is notably rare in adults and is predominantly diagnosed in infants and toddlers, making this age group the most relevant when discussing the occurrence of the disease.