OK. I'm "pushing 80". (Well, pushing 77 but ... close enough.) In the last five years, I've kinda learned where the notes are on a solo tuned instrument. So, I'm proving to myself that an old dog can learn a few new tricks. Sit. Roll over. Shake.
But, things like "non-standard" tunings, flipping slides ... I dunno 'bout that. It's kinda like teaching an old dog to do long division.
Think I'll just stick to solo tuning and work really hard to figure how to play in a handful of keys, and just be satisfied with what I've accomplished.