The wheelchair´s width is 58 and the door is 60 - I do it myself. Why (in the insurance company´s opinion) only children above 10 years can have it, I don´t get it?

The wheelchair´s width is 58 and the door is 60 - I do it myself. Why (in the insurance company´s opinion) only children above 10 years can have it, I don´t get it?
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