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These principles are good for all ages. Similar to how designing for handicapped users is generally better for everyone (see Good Grips).

Generally yes, but sometimes no. Take for instance the requirement to have the fire alarms at toddler height in our local daycare.

How else are toddlers going to learn how fun a prank call is?

This daycare heard about the Marshmallow Test and decided to one-up it with the "What A Tempting Fire Alarm (Oh Wouldn't It Be Fun?)" test.

thats a thing, we are all humans