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whitehouse.gov/wp-content/uploads/2024/02/Health-Summary-2.28.pdf
I know we were all shocked at the way Biden behaved at the debate, and how tempting it is to jump to the conclusion that he's got dementia, or Parkinson's, or Alzheimers, or whatever. But despite knowing something about these conditions and how they present, most of us aren't doctors, and even more of us aren't *his* doctors.
As you can read for yourself by following the link above, Biden had a thorough medical checkup in February (which we know because he publicly releases the results of those, unlike Trump) and his doctors didn't see evidence of decline that they were concerned enough about to order further tests.