A lot of these also apply not just to retirement, but to looking for a new job.

What a stupid article. To save you the click, here are the "subtle signs":

   1. Arrive at work feeling numb
   2. Shrink from learning new tech tools
   3. Avoid promotions
   4. Catch ‘the Sunday scaries’
   5. Constantly check your 401(k)
   6. Wish you could volunteer more
   7. Notice your peers are gone
   8. Feel left out of retirement
   9. Hate your boss
   10. Get achy knees

Most of these are signs that your current job sucks & should probably try to look around for a new one. The rest are signs that you're yearning for things outside of work, which is completely normal.

Well I retired 12 years ago and I said no to every point.

1. No 2. Actually learning more now 3. Didn't change - would I fit the job? 4. No 5. Had no idea (UK equivalent) 6. No change 7. Happened long before 8. No 9. No 10. Not yet