I bought my mathews lx from a co-worker 3 years ago. He had it for 4 seasons. The bow shoots great and I took a few deer, squirrels and a racoonthis season. How long are they good for? How often do you get a new stick-n-string?

A bow should last a lifetime depending that you take care of it.
I have an old Golden Eagel Evolution that I used for over 13 years , only had to replace the limbs and string once.
How ever I did get a new Darton Maurader last september as a gift but I still use that old bow as a back up and it still shoots great.

I currently use a Pearson Spoiler from the early 80's. Killed bunches of deer with it. It's loud, heavy, not much let-off.But lots of dead deer.

depends on who ya talk to on here.. some of them get the top of the line every year. im not jus talkin one bow they get 3 or 4 top of the lines... personally.. i like to update maybe 3-4 years.. but like everyone else is sayin you keep care of it they should shoot as long as you need it to

most folk' ll tell ya to get new ..but as one feller said..take care and itll last..gotta .restring and the like. I gotta a Martin lynx magnum for many years and still gits deers

You can sure keep it quite a long time. But I believe the limbs loose some of their energy quantity after a while.
My buddy had limbs replaced on an older Martin bow(5-6 years old).
and we chronographed it w/ the new limbs at 14fps. faster than the old ones. It could have been better material design in the new limbs,but it really opened my eyes. A bow takes alot of abuse when shot. Other than the parallell limb bows, conventional limbs configurations take much more because they travel a greater distance.
I'm no engineer, but it only makes sense to me.
Of course that's not to say you can't shoot it. You can & my friend did,very well. Just not what it was.