All languages are ageing languages so i think a better term to use would be mature languages. That conjures up a completely different emotion :)

> Don't get me wrong: Java, C#, C++ are maybe not aging but their user base isn't growing anymore or not with the same strong growth rate like newer languages

Is this anecdotal? Because its very hard to know what is going on with absolute certainty and trends vary from place to place and over time.

Just thought I'd take a snapshot of Stackoverflow question metrics:

  Java       180,637
  PHP        167,657
  Javascript 151,666
  C++         97,785
  Python      82,640
  C#          45,493
  Ruby        34,497
  Perl        14,735
  Scala        6,670
  Clojure      2,283
  Lua          1,616

It's important to not take these figs has gospel outside of Stackoverflow.com. However considering Stackoverflow only started in August 2008 then these figures do suggest that mature languages have been growing at a very healthy rate.