As stated above it is a gamble with any career change. But going for something, even investing in real estate, marriage, starting a business or buying shares is too. Many things are. So this is no different.
Experience counts as does supply and demand. But what have you got to lose? Money simple.... but does that really matter in the big scheme of things? Being happy with what you are doing at the time keeps you and the family happy.
There are many opportunities in aviation, you just try for them all and eventually a niche that is right for you will come along. Times are crap for employment right now, but employment situations swing both ways.
If you want to throw your hat in the ring then do it. It will be after all, your attitude and ability, and not your age that will get you a job. Good luck. (41 isn't old!.... I'm 41!)