Earlier quoted context omitted.
> Tomcat ... OK you can have one from 1863. There is a really good security back port effort but why on earth start off with a kernel that is using a walking stick. Because old software is battle-tested and reliable. Moreover, upgrading software is ever a pain so it's best to minimize how often you have to do it. With a support policy of 10 years, you just can't beat RHEL (and derivatives) for stability.
RHEL's kernel — the actual base of the operating system with the largest effect on stability — is not old. It might have a version number from the middle of the last century, but there are so many massive backports in there that in a few years time after release it gets closer to the latest mainline than to its original version. Don't expect too much from it.
https://docs.redhat.com/en/documentation/red_hat_enterprise_...