**Neither a teacher nor a native speaker.**
I will try my best
2. Adam cannot speak German, neither can I.
3. Can I have some french fries? Sorry, there are no more.
4. The ancient, Troy, does not exist anymore.
5. His voice is not heard anymore.
6. I am as old as you. (But I believe your sentence is also correct.)
"The same aged" -> no, because you cannot use "The" with an "adjective", at least not in this sentence.