I'm so excited to see mark this tour, I've seen a few shows over a few tours so I have my memories, I see this as a way to say goodbye and enjoy the music.
I think he's working really hard to get through these shows, sure he's "only" 69 (still pretty up there!) But no one knows how people age especially someone who has spent a long time on the road, touring , playing , working etc,
As i've said in the past, I feel like Mark's playing has been on a slow decline since 2010 for whatever reason (and there could be many many reasons for this aside from lack of practicing) He doesn't need the money that's for sure. He could've stopped touring 20 years ago. He is pushing through (at least partially) for the fans so whatever he can give us that he feels comfortable with i'm happy with also.
It will be an emotional end to this tour, And I hope that mark continues with some sporadic shows at the RAH or elsewhere, I just hope he has another album or 2 left, I feel like he has an endless supply of great songs out there and I hope to hear as many as possible!