this post says nothing about you are missing balls now that you made routinely in the past and you want to know whyMy question is once you are confident of OB contact point, do you shoot the CB with center ball aiming the cue tip directly at the contact point or aim the edge/contact point on the CB at the contact point? Elementary or intuitive I'm sure to good players.
if you really want to know why you miss now i would say this
in the past you knew where to aim to make the ball AND you could get the cueball to hit that target(not by aiming directly at the contact point except for straight in shots)
i like show beginners if i took a silver dollar and had a portion of it stick out past the rail nose and asked them to hit the part sticking out
they realize quickly if the cue ball is coming at it at an angle they will hit the rail first if they aim directly at the part sticking out
they then start to understand you have to get the curvature of the cue ball to hit the target not the "front "of the cue ball'
now that you had to read all of that
the fact that you could make balls means you figured it out by a process that worked for you
so thats not the problem
you are older
when is the last time you had your vision checked.....maybe you need glasses or a change in your prescription if you already wear glasses
maybe you have a slight tremor now
there are lots of reasons why you have lost your accuracy
maybe have an instructor watch you now and find out what an educated eye sees
i would advise going back to drills on fundamentals to improve your accuracy
you already know how to make the ball
hope this helps
respectfully.....
bbb