He is not a 'showman', nothing fancy, just solid music, great musicians (Brian Kennedy, Georgie Fame, Candy Dulfer) combined with many changes over the years from blues (tributes to John Lee) to rock (Jackie Wilson Said) to introspection (Poetic Champions) to R&B tinges (Goin Down Geneva), to religious themes (Hymms to the Silence) to Country (Down the Road (not his best effort IMHO)).
I saw him at the Shrine in '72 (Herbie Hancock opened) and at the Masonic in SF three times, once with the late Sam Butera.
But he keeps rolling along on his 401K tours.
One word. Eagles
I went and heard the Moody Blues in concert here in St. Louis earlier this month. They sounded great! Justin Hayward (lead vocals, lead guitar) is 66, John Lodge (vocals, bass guitar) is 67, and Graeme Edge (drums) is 71. They also have four younger side musicians that play with them. Some of the Moody Blues’ music is dated, but a lot of it holds up well.