This product is made of plastic and is used to peel oranges. It has a ring for a finger to fit in and a curvature to fit the diameter of the orange. There is also a protrusion to cut the orange skin.
The designer might have considered how the product will be used, why will it be needed and how effective it will be.
Will the elderly face difficulty using the product?
Yes. The thumb ring is hard uncomfortable and when the product is used and it will hurt the users thumb. the protrusion is also not sharp enough to cut some orange skins.