Girls, older brother figures?

So I have two questions, really: do women (adults, not literal girls), actually want older brother type figures in their lives? And would you be disappointed if you later found out that they were into you? I’m taking like, ten+ year age gap.

reason why I ask is I saw a Reddit post about a 50 year old man asking if this 25 year old woman (coworker) is into him. Of course, everyone was like, “no.” He also wrote that he agreed but he provided details and I honestly see why he would think that. Someone responded saying, “if you ask her out for coffee sometime, as a date, she might be extremely disheartened if she thought of you as an older brother figure.”

I see that’s a possibility but I also think that if a woman isn’t into you, she wouldn’t be acting exactly the way she was, even considering the huge age gap.

so my second question is if you were 25 would you behave in a way towards a 50 year old man in the same way you’d behave towards a guy who you want him to ask you out, but not worry about your behavior because you think the age gap is a clear enough reality for the guy to know that there’s no way you’re actually into him, rather you just see him as an older brother figure? I guess I have a third question: would you be extremely disappointed if he ended up saying he had feelings for you?

Girls, older brother figures?
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