The first two points don't gibe with my experience with ticketed trades, to be honest. I can't speak to your last point, though it makes me sad.
To the first, the only guys I know with declining paychecks are guys in piecework trades like roofing. Sparkys and plumbers work right to 65 with no issues, as do most others. I did rodbusting for a while, and lots of those guys were well into their 50's and 60's and just fine, though they were tougher than saddle leather. If hourly isn't for you, starting a small contracting business is always an option with minimal investment.
Hours are hugely variable, with plenty choosing to work 7-3:30, M-F. Lots do more, but the OT makes up for it and then some. You can make a decent living at union rates as a journeyman. Not 'get rich' money, but around $90-100k/yr. If you want to make more, you work the OT (as most of us salaried suckers do anyway without extra pay) or you go on your own.
If you want the big bucks, join the elevator mafia. Those guys bank large, and from what I've seen, you definitely don't have to worry about wearing out your body...