Why do people talk down to us as we age? Like once we’re 55+ we are idiots! I’m under 55 & get talked to as an idiot/child by people?

How to respond?
Any age people can be condeccending or rude or sarcastic..
Example 75 yr old in a store? “Can I HELP you?” usuing rude tone
Update: Condescending.. error..
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