How can I put this..........................Hell yes.
The sad part is that ships that are five or ten years old are considered "old". I did an Asian cruise on Statendam and other than the inside cabin I loved the ship. It was a destination oriented cruise and the ship had everything you wanted for when you arrived back from a long day or for the few sea days we had.
Carnival Liberty is going into drydock and it is "supposed" to be having a major upgrade. This ship is six years old.
We will be sailing on Millennium next year on another Asian cruise. We sailed her about ten years ago when she was almost brand new. We loved it but we'll she how well she's aged.
If the cruise lines keep the ships shipshape then it's fine. If they let them go then it may not be too much fun to cruise them.