It is probably old, and that is how long it probably takes to build a fighter like this. How long did it take for the F-22 to be ready? That is considering that the U.S. Aviation is far ahead and has the funds to do so.
I see no point in funding AMCA when there are already funds allocated for the PAK-FA. If the armed forces are serious about AMCA than it is a fighter that will be used along with PAK-FA and will come out 2025+.