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Commodity-level virtual reality equipment is now available to all ages. To better understand how cognitive development affects people's spatial memory in virtual reality, we assess how adults (20-29 years old) and teenagers (14-17 years old) represent their spatial memory of objects in an immersive virtual environment (IVE) where height is encoded. Despite virtual reality being a favorable conduit for the study of egocentric spatial memory, prior studies have predominately looked at objects placed at similar heights. Within a stairwell environment, participants learned the positions of nine target objects. In one condition, all objects were placed near eye height. In another, they were placed at varying heights. Our results indicate that participants' errors and latencies were similar in both environments, and across age groups. Our results have implications for the development of IVEs and the expansion of immersive technology to a more diverse, younger audience.