I PVR'd after Brüggen closed, did 4 years in KSA and have now been on the 'bus with CX for almost a year - and I'm pushing 40. There are plenty of people here who have joined directly from a FJ cockpit, many of them > 40.
As an aside, my time in the Kingdom kippered my marriage, so almost everything I made there is going to her...
Pretty good money, sh*te life. If you DO go, have an exit strategy, and don't be surprised about how little you can save out of that reasonable salary.
PM if you need more.