Can I use these interchangeably?

(for someone who used to be handsome and rich)
If I say;
You are no longer both.
Now you are neither.
Neither of which you are any longer.

Question

Can I use these interchangeably?

(for someone who used to be handsome and rich)
If I say;
You are no longer both.
Now you are neither.
Neither of which you are any longer.

Answer

They are not interchangeable.
You are no longer both = They are one of them. They are rich OR they are handsome. They are not rich AND handsome.
Now you are neither = They are not rich AND they are not handsome.
The third one has the same meaning as the second but it's far more formal.