General rule, the longer the cruise, the older the passengers. The short 3, 4 and 5 day cruises have more younger people (under 40). The 7 and 8 day cruises have a perfect mix. The 9 day and above cruises are decidedly older with more core families, and few single folks.
Also Europe and Hawaii will draw older passengers than the Caribbean and Mexico. Alaska and Canada would be pretty middle of the road. Alaska used to be for older passengers but that has changed quite a bit.
I did NCL America to Hawaii a few years ago and at least 75% of the passengers were over 65.
I B CRUZIN'
(solo cruzin' by design)
CCL Victory, CCL Imagination, CCL Victory
Past Cruzes: RCCL Navigator, RCCL Majesty, CCL Destiny,
Glory (2007),Liberty (2007), Fantasy (2007), Destiny (2006), PofAm (2005), Inspiration (2005), Fascination (2004), Victory (2004), Fascination (2004), RCCL VOS(2003), Fantasy (1999)