It's a job guys, some are happy with it, and some are not. If the senior guy is happy where he is, be thankful. His resume looks a lot better than yours, you don't want to compete with him for the job.

As for retirements in the next 18 months, I would predict that little will change from the current amounts. When 65 resumes, we will see the number posted for sure. Who knows what will happen for hiring. The eternal debate of the pilot shortage will only be answered in time.
I would think however that if we see a rebound in the world economy over the next year and the DOW return to the 14's, retirements will see an uptick. Pilots hanging on will have regained some of the wealth they lost in the crash and would be able to walk away with it.