Access to nutritional resources is limited for juvenile herbivores that feed on plants with well-developed structural defenses, such as a thick shell surrounding a nutrient-rich seed. In aggregative species, juveniles may take advantage of the food processing behaviors of larger conspecifics to facilitate access to limited food resources. This hypothesis has not been well-tested in herbivores that feed on structurally defended plants despite their important role in both natural and agricultural systems. Juvenile herbivores often lack the fully developed feeding morphology of their adult conspecifics and thus may depend on adults to damage the host plant’s feeding barriers. We examined whether juvenile leaf-footed cactus bugs, Narnia femorata (Hemiptera: Coreidae), use this strategy when feeding on cactus fruits that were previously fed on by adult conspecifics. We hypothesized that juveniles would feed in the same locations as adults, allowing them to use the semi-permanent stylet sheaths created by the adults during feeding to access nutrients within the seeds at the center of the fruits. To test this hypothesis, we marked where adults fed on fruits and then placed juveniles on the same fruits to determine the location of their feeding in comparison to that of the adults. We found no evidence that the juveniles take advantage of the stylet sheaths created by adults to facilitate their feeding. It is likely that other feeding adaptations in juvenile herbivores, such as mouthpart plasticity, play a larger role in gaining access to nutrients essential for development and survival.