How many careers can we have in a Lifetime?

 I think people say, and the common consensus seems to be that you should change career every 20 years or so, going beyond that point, and you settle into mediocrity or sheer indifference. I spent 22 years with the Army, albeit a mixture of 17 years with the British Army and five years with the Australian, so I think I had a mini career change there?
It certainly was a challenge, as it was a project, which I thought would be fairly easy to deal with, oh no, our dear Australian friends obviously have differing viewpoints from the quite strict Pommie view, but it was good fun and not regretted for an instant. And to be honest, which Army did it correct?


After serving for 22 years, I decided I had become stale, the drive was not there anymore so a career change occurred, where I entered into Australian Financial Services as a Financial Adviser. This was a great career for me, and I still practice, but again 20 years on; I have started to work more in the academic area, now having completed an MBA 2 years ago, and being appointed as an Associate Professor with Torrens University Australia, and completing my PhD, I wonder if my next career change is just around the corner.

So, every 20 years, if you get an itch, scratch it, look for the new horizon and those new beginnings as the universe may be telling you something?
Enjoy.