I just recently returned from a 10-night on the Mercury. The average age was over 80. The activites were geared for Seniors.
I am assuming the "over 80" is a bit of hyperbole...
Either that or we are living in some sort of weird alternate universes...
We just came back a couple of weeks ago from a 7 night Southern Caribbean out of San Juan on Celebrity Summit...
We are in our 50s now, but cruising with Celebrity for some time...
On this particular cruise, as always, being social people, we made friends with and hung out with a number of people...of all ages...
When we went each night for drinks at Michael's during the Elite Captains Club Happy Hour, we always drank with the same group of 40- and 50-somethings, though I'd say the club was about 50/50 with the others being older (though not octogenarians)...But you'd expect that of Elite Captains Club members since you'd have to have 10 X cruise points under your belt...
But, on our shore excursions, we ended up with the same couples seemingly every time...and a lot of them were 20-somethings and 30-somethings...and we ended up doing some other things together (we felt a little like the parent-figures at times)...
We seemed to have a large number of young honeymoon couples on this cruise...and, really a wide spread of ages...
It may be that the 7-night on a newer ship gets this...But, over many Celebrity cruises, this has ALWAYS been our experience...
As to activities "geared for Seniors", huh???
The activities are pretty much the same as most ships--entertainment, casino, bingo, piano bar, karaoke, trivia, lectures, etc.
Oh...but, if you are expecting Carnival--with wet T-Shirt contests and belly flop competitions, no, you won't find them...
I do not consider that as geared for a younger age group, I considered those as geard for a more classless crowd...
As to a cruise full of Octogenarians, I've only encountered that once in all my close to 30 cruises on 7 different lines: my 2001 Baltic cruise on the old Crown Princess...
So, I guess the answer is that it happens...
It probably has something to do with length of cruise, destination, time of year, group bookings, age of ship and other things...not necessarily the cruise line...I certainly wouldn't mark an entire cruise line as such...certainly not Celebrity...
HAL does tend to cater to an older crowd...but moreso, the "luxury" lines (Seabourne, Regent, SilverSeas, etc.) because they price out most younger people --who tend to still have some money concerns...
Carnival gets that "younger crowd looking for a party"...but, to some of us, it's not the age, it's other aspects of the demographics...Carnival advertises "Fun" and "Low Prices" and tends to attract people looking for the lowest price, the most noise and activity and willing to compromise on service, comfort, roominess and overall quality...It gives its customers precisely what they want...and expect...so, that's a good thing...there's a cruise line for everyone...
For me, having done three on Carnival, I am never going back there...and it is not about age...It's about being able to discern the differences in service, to realize that Carnival crams too many on their ships...and to see that they confuse "Fun" with "activity"...Trying to whip people into a drunken frenzy while crowding them onto crowded areas of the ship is just not "fun" to me... Not now when I've reached my 50s, but it wasn't really either in my 20s or 30s...
If someone really wants a great deal of fun and a ship that better caters to a younger crowd, a strongly recommend Royal Caribbean--where the amenities (Rock Climbing, Roller Blading, Golf, Ice Skating, Surfing, etc.) blow away Carnival...
But, if one--of ANY age--wants a relaxing vacation with great food and service, you simply cannot beat Celebrity...
And I have yet to cruise on a Celebrity ship where the age demographics did not evenly span the various age groups...