Celebrity is very comparable to Princess and H.A.L. in most every way. There are lots of people of all ages and generally the Celebrity ships have a very mature crowd. I wouldn't worry about age at all.
I think the staterooms are also quite comparable. Perhaps a few more square feet than Princess and a few square feet less than H.A.L. The quality of furniture, bedding, etc. is quite similar.
Post Edited (05-06-04 19:20)