None. There is no such thing as a mid-life crisis. It's just men realising that they want to get rid of the horrendous piece of automotive drudgery that they were forced to buy; and re-fall in love with the pleasure and enjoyment of pure driving.
Going from a Nissan Juke to a Nissan 370Z is not a crisis, its a revelation!
besides, have you seen where the speedo is in the mini, a massive dial in the middle of the dash, yet the rev counter is directly in front of you...barmy!
Unless, Joe, he's borrowed his missus car because his is off the road whilst he get a new turbo fitted/engine remapping/<insert other blokey thing here>
And others Joe, buy flash cars because they love cars. They enjoy the driving experience, they love the sound of a meaty V8, they enjoy testing themselves, and they also like the asthetic appeal.