For those in the cyber security field, is 48 too old to start down that road?

Well, it's a tossup.  IF you have some good technical aptitude already, you could learn it and become proficient at it pretty quickly.  I personally would be bored to tears doing that work.

So, the problem is that age-"discrimination" is a very real thing.  As I mentioned, one of the main reasons I'm currently working two jobs is so that if I get laid off from one I could still have the other.  Being 56, there's probably very little chance any company would hire me over a younger competitor ... all things being the same with regard to our salary requirements and skill levels.

Also, if you embarked upon that career now, more and more this type of work is in fact being offshored to India, and-or third-party companies that then in turn offshore to India, so there are fewer and fewer actual positions available for Americans in American companies ... making it even more difficult for a 48-year-old (and presumably in your 50s).

I actually think that the best careers in the future will be certain types of skilled trade labor that can't really be offshored or where illegals wouldn't be certified to do ... e.g. electricians, and auto mechanics (who require serious training and, more and more, quasi-IT skills as modern cars are actually half-computer-half-car, and the computer part is growing every year).  If we get to all-electric cars, you'd need to be an IT guy and electronics whiz rather than the traditional grease-monkey mechanic type.

Nursing and most things medical will be booming, but those are also most at risk of being forced to take immoral vaccines or participating in immoral activities, such as administering birth control, vaccines, organ transplants ... and, in the not-too-distant-future, participating in euthanasia (some already do in hospices).

So it's a very tough time out there for Catholics ... and it's only going to get worse.  We may very well be subject to our own Holodomor fairly soon ... where we can't morally participate in their system and, given the social credit system, will be banned from buying and selling and eating if we don't have the right opinions and attitudes.