Why would a man in his 40’s get nervous around a woman in her 20’s? Would he fancy her despite the age gap?

I thought older men wouldn’t get nervous around younger women or just wouldn’t be interested in them.
He’s not predatory and is very respectful of me, but just very nervous. He’s a proper gentleman.

Why would a man in his 40’s get nervous around a woman in her 20’s? Would he fancy her despite the age gap?
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