Is anyone else worried about Biden's mental health?

Joe Biden has almost made a career out of gaffes. But recently, it seems to be something a bit deeper. This week, while speaking to crowds, he stated he was running for the US Senate (instead of the presidency), urged them to get out and support him on Super Thursday (instead of Tuesday), and repeatedly couldn’t remember the name of the president before Trump (even though he was the VP under Obama for 8 years.). Does anyone else think this is just a bit too weird?