Falconry would be the worst midlife crisis because you have to be so serious about it. They don't fuckin play - you have to do a 2 year apprenticeship under a more experienced falconer before you can be on your own. You can't even get a bird until you've taken a test, built facilities, bought all the equipment, and passed an inspection. You can't be like, "hold up, I'll be back in a few years with a falcon and then I'm starting a cult, just be patient." That's not a crisis, that's going to bird college.
(Full disclosure, everything I know about falconry came from a Winter Soldier fanfic, but I just looked and it's all true. And very intense.)