The 30th was yesterday.
It may be an old plane but it's going to be around for a long time yet. Boeing have given up their supersonic project (NASA withdrew their support I think). I'm not aware of anyone else working on it. The last attempt was the Russian Konkordski in '79(?) and we all know what happened to that.
They may be old but the maintenance is top notch - the safety record is pretty spectacular, huh?
Try it - you'll love it!