How to not give "How do you do, fellow kids" vibes when talking to 18 and 19 old girls?

Sometimes when I try to flirt with girls it feels like they think of me like this

How to not give How do you do, fellow kids vibes when talking to 18 and 19 old girls?

I'm just around 9 years older. What can I do to turn off those vibes and get them to think of me as cool and handsome

How to not give "How do you do, fellow kids" vibes when talking to 18 and 19 old girls?
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