Turning 65 and Medicare

Frankly, I don't know how to categorize this subject, so I'll just go on and talk about the problem. Most of us eventually face the issue.
When you’re lucky enough to turn 65 and you're still working, what should you do? Should you quit?  Do you have to quit?  Can you start collecting social security payments if you decide to keep working?  What about Medicare... do you have to enroll?  If you have medical insurance at work, do you have to drop it?  Should you drop it?  What is best?  What is required?  
Who knows?  Not me.  I did turn 65, and am still working.  I had no clue about what to do.  Nobody tells you, and you can't look it up. Here I am, a “big shot lawyer," and I not only don't know the answer, but don't know how to find out.  No use looking at the law…. too complicated.  I fumbled around, made some mistakes, but somehow I'm o.k…. I guess.  Of course, I have not been sick yet; that’s when the rubber meets the road.
I commend to you an article in the Wall Street Journal titled Retirees Snared by Medicare.  Boy is it complicated.  Check it carefully.