Celebrity Cruises attract a slightly older passenger than a Carnival Cruise for example.
Each cruise, ship,itinerary and the time of year will impact the age on board.
I have never been on a Celebrity cruise that didn't have a reasonable amount of people in each age group on board. Longer cruises will tend to have a slightly older group only because of cost. On a recent cruise we sat with three
honeymoon couples from 22 to 30 years old, one 10th anniversary couple in mid 30's and us old folks at 50. On another we were in the middle of the age group
and on our last we were the young folks. Had a blast on all three with all the folks regardless of age.
Enjoy ( 6 days to next cruise for me)