Why are young guys so rude but old men aren't?

I am 29 yr old female. Young guys under 40 usually never talk to me. The very attractive ones ignore me. They usually won't talk to me at all unless they are at work in a customer service job or law enforcement etc.

Only old guys seem comfortable talking to me. Its the old guys that are friendly and initiate conversations, say hi.

Why are young guys so rude but old men aren't?
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