No, and I think I can speak for dogepadre on this one, who was clearly speaking of cognition, mental abilities.
aka Biden is demented.
Trump is not.
Yes, it's rare for someone young to be afflicted with dementia, or whatever it is that Biden has, but that doesn't mean the comparison between Dementia Joe and an obviously dynamic and mentally sharp Trump is about age.
Now, tbf, Trump is 78 and there is no way he can be as mentally sharp as he was when he was 30. But he's got waaaaaaaaaaaaaaaaay more on the ball, mentally, than Biden has, or probably ever had. Dementia or not, there's nothing smart or even mentally sharp (now, at least) about Biden.