Older male at work has always told me what to do and given unsolicited advice both personal and professional at my retail job. Why?

He has been doing it a lot lately. He will give it to me and then walk away lately. So i dont even have a chance to respond. And he mumbles it a lot lately. It makes me uncomfortable.
Older male at work has always told me what to do and given unsolicited advice both personal and professional at my retail job. Why?
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