Not senior moments as such, but quite a few junior ones:-
1. Landing at Providence, RI in indifferent visibility during the wee small hours on the old runway 5L (now TWY Victor), I realised at about 500' AGL that I was actually lined up for an approach to Post Road, which runs parallel about 200m to the west. When what I thought were RELs suddenly changed from red to green the penny dropped, and a bootful of right rudder saved my blushes without the tower even noticing. I've often wondered how long it would have taken me to figure it out if the traffic lights hadn't changed. Unfortunately I was only in my mid-twenties at the time, so can't even plead early-onset Alzheimer's.
2. When I was still younger (much younger in fact) and flying in eastern Ireland, I managed to confuse the Royal Canal -- which I was not supposed to be following -- with the Grand Canal, which I was. Fortunately I was monitoring the Baldonnel military frequency, and heard APP warn an incoming aircraft of an unidentified primary trace, believed to be low-level, down by the Royal. I responded in a small voice, "Ah, I think that's me." It was. When I landed at EIWT, I made the interesting discovery that there was a difference of twenty-five degrees between my compass reading and the runway orientation. Of course, being wet behind the ears, it hadn't occurred to me to perform that check when it would have done some good, forty-five minutes earlier.
3. Several even more embarrassing things that I'm not going to mention here.