Now the shower gel is very thin. 15 years old is still a child after all, and the most capable person is a teenager.
Today's children may be tall and heavy because of good nutrition, and basically reach the level of adults, but they are still children after all. You should still buy your own shower gel.
Men's shower gel is generally designed for men's rough skin. Not suitable for children.
I hope my suggestion can be used as your reference. Thank you.