How do i find my old content?

Yeah it stops after a while. I recommend the ghetto google search method:

site:gamedev.net "username"

There may be some overlap if you get quoted often but you should get most of your content back that way.

But why does the search stop? I mean has my old posts been deleted for space reasons or is it some other reason?
I often find the need to go back to old stuff i learned here and read it again.

Now, appearantly gamedev wont let me anymore.

But why does the search stop? I mean has my old posts been deleted for space reasons or is it some other reason?

Right now in order to keep our search index lean and fast to reindex it only goes back 365 days. Using the google search (default search option) and entering in your username might yield a larger number of results.

site:gamedev.net "username"

Might I suggest the somewhat-more-refined site:gamedev.net "Started by suliman".

I'd wager that is better than the built-in search in almost every case.