Gary ... sometimes the reason we only know people our age who are doing something is because they are the ones we 'hang out' with ... believe me, on our last two cruises - 2009 and 2011 - there were just as many people in the 30 to 50 bracket as there were older ... and these were on the Norwegian lines which are not known to be 'geared' towards younger people as the Carnival lines and others ...
And while a number of the 'lounge' acts - there are several on board - might have their playlist geared to a 'more mature' audience- playing tunes by Elton John, Billy Joel, blues, etc., the main dance club had a DJ and a live 6-7 piece band playing all the dance hits for that younger crowd ... and the club and dance floor was jammin' every night ...

Editorial note - I think in another post I said our last two cruises were 2007 and 2009, but that was incorrect ...