On the other hand Bolivia capped around 60 players in WCQs02.Brazil capped around 50 ones.Take a look at the forwards that were used in that period:Ronaldinho,Luizao,Rivaldo,Romario,Edilson,G uillerme,Jardel,Amoroso,Elber and maybe i forget some others.
In Uruguay the only true all time classic is Recoba,while Carini,Rodriguez,Magallanes,Dario Silva,Olivera etc despite having a good footballing age,are not in the squad anymore.Same with Montero,who is a bit over 30 and JUVENTUS player but not in the squad!
My country's NT has about 5 players in their 30ies.
I agree with you for Ecuador and Paraguay.
If you compare Colombia's 11 in the first games of 02 Qs and 06 ones,you will find a lot of differences.
I don't think these nations are like England who despite having bunch of quality players in the Premier League has Campell,G.Neville,P.Neville,Butt,Scholes,Beckham,O wen in their calculated squad for years now.