When I went to the guitar store last week and bought my first electric guitar at age 51, I thought, now if that's not a sign of mid-life crisis, I don't know what is! I am staying away from Corvette dealerships and motorcycle shops for now.
Anyway, glad to see that I'm not alone here. My wife nicknamed my guitar "Ms LuCy" for mid-life crisis and because I'm a big Blues/R&B/Country fan and I bought a hollow body Sheraton II so that I could play like BB King with his guitar - Lucille (and Chet Atkins).
Good luck old dudes!