General   (General discussion, talk about anything.)

You don't have to be old to get things wrong.

UK had a Foreign Secretary who thought The Baltic States were on the Black Sea. It did not stop her party electing her to be party leader and PM.

Biden does make errors which are of concern, so does Trump. The latter is not finding his errors scooped up by a campaign to discredit him.

Objectively though, whilst Trump is more lively than Biden, his errors are more indicative of dementia, or severe cognitive impairment than are Biden's.

Firstly, they are not singular failures to recall. On eight reported occasions he has referred to when he defeated Barack Obama in 2016. This is possibly a perseveration error: clinically much more indicative of impairment than memory lapse.

I could go on, but if anyone is interested, read for yourself the comments online by neurologists concerning their errors.