Do I get more stupid as time goes on?

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Hi, everyone, I return to work today after taking a long holiday, and I find a truth that I get more stupid than ever, and my memory cannot really serve me. Now, I'm slow in thinking and cannot make a response to my colleague's question actively. What's the reason? Maybe I drink too much alcohol during the holiday. It kills lots of my brain cell. Or maybe I'm older so I become more stupid. Does everyone have the same feeling that you are more stupid as time goes by...