Answer: Age, race, gender and nationality.
All these factors can influence a person's perspective and worldview. Age is important because as people live longer, they tend to accumulate more varied experiences which inform their opinions. Moreover, mental development changes with age. Gender can also inform your perspective, as your gender tends to affect how you interact with the world and how others interact with you. Finally, race and nationality are closely related to the concept of culture, which influences how you think about societies, individuals and the world in general.