Final answer:
The claim that mass murderers are usually in their 50s or 60s is false, as they come from a broad age range, with many being in their 20s and 30s.
Step-by-step explanation:
The statement that mass murderers are usually in their 50s or 60s is false. Studies and statistics show that individuals who commit such crimes come from a wide range of age groups. However, most mass murderers tend to be significantly younger, with a considerable number being in their 20s and 30s. Age can be a factor in the profile of a mass murderer, but it is not correct to say that the majority are in their 50s or 60s.