Or alternatively you could be on one of their very old aeroplanes too, old aeroplanes that they run 24/7 rather than Jet2 ones that run about 16/7. I am personally very happy flying round in a 30year old Jet2 aeroplane. It's not about the age, it's about how many times it's been up and down.
What very old a/c are TOM or TCX basing out of NCL?
In the real world, if you book a bucket and spade flight out of NCL you are far more likely to get an older a/c if you book Jet2 than you are than with any of the competition.
Personally, I couldn't give a toss, but lets not twist facts.