"How old is that car?"
Translation:Jak staré je to auto?
This was not accepted: Jak starý je to automobil?
If auto is neuter, then staré; if automobil is masculine, then starý. To/ten/ta/to -- I believe to really "get" this requires actual full time immersed listening and speaking.
Just think, I am only getting started. What awaits in the great beyond? ☺♪♫
This is a difficult one. Your sentence is actually possible. This because it is the "je to/to je" pattern.
But I am not sure whether it should not be a translation of something like "How old car is this?" - however it does not sound like natural English to me.
I added the translation.