Just my thoughts flymoy.
I work for Jet2 now. I only get involved in recruitment in the sim. We only report what we observe and have no info at all in how the rest of the process works.
I do know we use a scoring system, so perhaps your score met the minimum requirements for the pool. As more people are added, maybe they just had a clear out and dropped anyone below a certain score. I personally think that you should at least of had a generic email describing why you lost your place. Although I know the recruitment team are working flat out and maybe not a priority to them
I would apply again as the scoring is somewhat subjective. You never know next time round might score higher.
I got my first Airline job at 35 at Monarch. So you are definitely not too old.
There is a saying that it's better to be lucky than good. Although you get more lucky and good (at assessments) if you keep trying.
At least you have another career in the meantime.
Best of luck.
Cheers.