Despite I oppose k harris, when president is impaired, why not replaced by vice president?

1, the vice president replaces president if he dies.

2, what if he is impaired, lost ability to lead?

biden is not only worn out to the point of mentaly debilitated, he is too weak to get judged...

3, if true must be replaced by v. p. so was that just a lie, to avoid punishment, if lie, he was not replaced, why not court?

4, if true with medical approval then v. p. must replace the incapacited president?

5, who can make that decision and why didn't do it yet?

Updates
+1 y
article 1 of constitution that INCLUDED women in word "citizen" said that "President Inability of Duties of that Office, shall go on the Vice President.
the Congress may by law provide for the Case of Inability, declaring what Officer shall then act as President," so...
WHY aren't congress, senate n the house doing this?
Despite I oppose k harris, when president is impaired, why not replaced by vice president?
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