We have chickens. They can live about 15 years if well cared for, so be prepared to commit to them for that long.
Predator proofing is harder than you might think. To keep out weasels, the entire chicken house needs to be clad in 1/2 inch hardware cloth. (A weasel can get through pretty much any opening a large mouse or small rat can get through. We learned this the hard way when we lost one of our ducks (the other duck was severely injured) to a weasel who somehow wedged itself under the door of our duck house, which has double, insulated, walls and windows protected by plexiglass and wire.) If you have hawks or other birds of prey in the area, a good fence isn't enough - they need to be protected from above also.
Be prepared to organize your life around having to get the chickens securely into their house by dusk. (Apart from weasels, raccoons and foxes can climb most fences, and raccoons will reach through chicken wire and pull off heads.) If you live in a area with free roaming dogs, those may be the biggest threat to your chickens, other than humans. (Six of our chickens were stolen one night - we now have a padlock.)
Our chickens (and ducks) are delightful.