My 20 year old VMPS Super tower III's still sound great to me but today's best speakers with BE, aluminum ceramic oxide and RAAL tweeters have a more articulate extended treble range. You notice it when you have them side by side. With the RAAL tweeters I hear percussion and other sounds that come forward in the listening window that are not as obvious with my VMPS towers.
To my ears, 20 year old speakers typically have a different sound than those with the latest tweeter designs. If you are looking for hi definition, silky highs I would listen to some new speakers like the Canton Vento Reference series, Revel BE series, Focal 926, Kanta, Sopra or Ascend Seirra with RAAL 70-20 tweeters. If that doesn't matter to you then a 20 year old flagship speaker in great condition will kick your room just as well.