can you give me some examples for good, new strategy games ?
New? Sorry man, but PCs are down on the game industry market as consoles are sadly taking over. This limits the amount PC exclusives are made, and that usually includes RTS as you can't play them effectively with a controller (unless it's like Halo Wars).
until now i've played the "age of" games but the look of them isn't so good because they are so old ...
Mini-lecture:
Starcraft 1 is a 12 year old (about) eSport in Seoul, Korea, that is as highly valued there as Football and genuine physical sports are valued here. To be a professional Starcraft 1 player you generally needed around 300 APM (actions per minute -- 300 divided by 60 = 5 actions... a second) with manual controls for things you likely take for granted (remember setting a rally point on gold in Age of Empires II? You had to spawn a harvester in Starcraft 1 and then right click the thing, there was no other choice) spicing up the amount of required speed by a significant margin.
Oh, and, well, this is what it looks like (if I do this right):

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... I bought this and its expansion for £7.50 less than a week ago.
Best deal I've ever gotten.
Gameplay > Graphics, and the controls aren't actually that bad either.
but i haven't found a better or compareable gameplay (expected of wc or sc, but they are also not so new ...)
Warcraft III, Age of Empires III, Starcraft II -- all have sufficiently cool graphics and moreso good enough gameplay for their money. Hell, you can buy AoE3 and its two expansions for £30 on Steam, and it was on sale (50% off) not that long ago...
Believe me, you're getting more than enough.
There really isn't much to say aside for what Gremlion nicely posted... although I would recommend if anything Command and Conquer: Generals and it's expansion (Zero Hour).
Good luck broski, but still... Starcraft is so awesome. ^^
- H