Pay more for children with large size
Growth of children goes like a spear. A child of 13 is soon 1.50 and sometimes even longer.
That means: 'Buy new shoes/clothes! ' then over and over again and many of them pass their height appropriate to their age. Someone of 14 and 164 cm or also wants to pay the same amount as someone of 14 years and 140 cm. Or should there be a child size of XS/S/M/L/XL/XXL? I once noticed that in stores where Paris outfit designs are sold.
But in most Dutch shops and webshops, children's shoes go up to size 35.
If you want bigger than size 35, that's going to be a check in the men's department. Sounds tough to someone of 14 but it's also expensive to visit men's department instead of kids department!