Went at 49, biggest reason was to get away from shift work. Actually enjoyed the job but the swing, swing, day, day, mid was taking a toll. I don't regret it at all. The actual monetary reduction was not that great. In the US when you get rid of AMT, lower tax rate, regain credits and being allowed to write off rental losses on income under $100,000, my monthly net was only around $2000 less. Plus like others mentioned there is a big demand for experienced ATCO's for consulting and other programs. If you want to work further that is not an issue and you can do it on your own terms. Plus, most of my friends went at the same time and we have plenty to keep us busy. Unfortunitly, it seems the opportunity for ATCO's and pilots to retire early in the future will be greatly reduced.