I'm going to keep this up sporadically because there is not much out there for a 50+ (just turned 60) training come-back from this. Not a daily log obviously, but the trajectory might help someone later. To summarize, it was 3 weeks ago, 3 broken ribs, punctured/collapsed lung and fractured collarbone.
Same treadmill run today was much easier, finishing heart rate 10 beats lower and not winded, which tells me that at least some of it is knocking the rust off. The 9 minute pace still feels harder than a previous 8 minute pace. At 60 it takes more to bring yourself back than it does at 30 so it will probably be a week of that, only 15-20 miles total. Then we'll reassess.