I'm nearly 50... I am suffering from a lack of confidence but my drive to compete/dominate is as strong if not stronger than it's ever been. If I didn't have that desire to win, I don't know why confidence in doing so would be shaken.There is zero doubt that older people have more nerves, less inherent confidence, and less need to compete and dominate, and there is almost nothing that can be done about it. If I recall correctly my perception of your age is that you are around that age where things change (for the worse of course) much more rapidly in all those departments so pretty good chance it is at least in part if not fully age related.

The whole sentence that you only partially quoted went like this:
This noise is the result (to the best I can determine) of my continued drive to compete and dominate. Combined with the knowledge of my failing eyesight and a serious lack of table time. So I whole heartedly agree that I'm suffering from a lack of confidence. However if I take away the undue pressure, my mental fortitude is considerably stronger. ...and honestly, I'm not physically playing all that weak. Just that I find myself fighting through crap I never needed to before.Not sure if it's an age thing, but more and more I find myself actively attempting to push through doubt and just general mental noise during play.
If I was playing more I don't think this would be an issue for me at all. The unfortunate truth is I don't get much table time. Regardless, what it has done is expose a weakness that would only be bandaided by table time. What I want is an actual tool to move passed the short coming.
I don't doubt for a moment that any and all players regardless of age would benefit from exploring sports psychology. (Dunning-Kruger)