The oldest in the fleet is G-CELP followed by G-CELR and G-CELX. Of the same age as G-CELH, there are also the following: G-CELI, G-CELJ, G-CELS, G-CELW and G-CELZ. Very close behind by a month or so are: G-CELA, G-CELB, G-CELK, G-CELV and G-CELY. This makes a total of 14 aircraft of similar ages.
Earlier posts mention the possibility that the company may be in the process of ordering a number of new aircraft, which perhaps might replace some of the older in the fleet but it will not be immediate. It is rumoured that the announcement of any purchase plans will be made by the company at the Paris Air Show in the month of June.
These older aircraft are probably not that cheap to maintain but on the other hand they were bought outright by JET2 years ago and probably at a good price.