I don't understand why age has anything to do with it. The newest ships are smaller than some classes of older ships
I stick with Encore, Bliss, any jewel class, sun, sky.
I haven't yet sailed the Sprit but will soon and expect it to be much like the smaller ships listed above. I won't experience Prima class until next year and Aqua in 2026.
I don't consider any of the others because they don't have observation lounges. Joy went from my sail list to avoid list when they butchered that nice OL.