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Putting aside whether it’s normal for you to be experiencing aging so early*, you should still see another PCP because they didn’t manage your actual concern: “I am experiencing issues functioning day to day life, and would like a plan to manage this”.
It would have been one thing if the doctor had said “yup, just you, so let’s get you into an assisted living arrangement now”, or “I’m fairly certain this is just your shitty genes, but to rule out anything else, let’s send you for X tests and see the Y specialist”.
From your post, it doesn’t sound like that was the case.
*The joke goes that after thirty you don’t get injured, you get permanent disabilities.