I'm using 35 as the midpoint to 70, the rough point at which, if you're doing the wrong thing, you can't kid yourself anymore. For some people it's 25, for som

I'm using 35 as the midpoint to 70, the rough point at which, if you're doing the wrong thing, you can't kid yourself anymore. For some people it's 25, for some 40, for some it never ever happens and they just live out their lives. The number IS arabitary +-10 years, but you won't have your midlife crisis when you're 5, nor when you're 90.