Is there a reason why people keep addressing me as ma’am?

I get it, I’m not 21 anymore but I’m not 55 either why I should be called ma’am. Like for example the lady at the store addressed me as ma’am and she’s older than me! She said “ma’am your daughter is running out the store” (my daughter is a very rambunctious toddler) and of course I ran after her and got her.. but the point is the lady knew I was young enough to have a small child so why use ma’am and not miss?

People are just being respectful (I’m overreacting)
I look older than 37
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Is there a reason why people keep addressing me as ma’am?
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