What does it mean if a man gets clingy after sex?

I have gone on 6 dates with an older man and after the 6th date we had sex. Every since he has been clingy. He is 42 and I am 28. I am just wondering if this is more typical of older guys. Thanks for you opinions. Also what causes a man to get like this.
What does it mean if a man gets clingy after sex?
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