Go to wikipedia.com and enter cats, it has detailed info on your Mr. Meowzers. There are also detailed sites all over the web that can help you on google as well. http://en.wikipedia.org/wiki/Special:Search?search=cats&fulltext=Search

Not necessarily. Each cat breed, mutt or not, has a lifespan. Some are due to feline genetics and diseases for that breed. If your kitty is doing well and had all their shots, there is no reason for keeping it indoors. I have had cats that lived in and out. Some have had problems no matter where they lived. If you are really that concerned about your kitty's welfare, do what you think is best in their situation. If you do keep your kitty in after it has been outside and starts getting depressed chances are her life outside is better for her. Just by making sure she gets all her wellness checks and shots by the vet then all should be well. Good luck in your decision.

I try to train my cats that there territory is the yard, I call them when they leave that space then they don't damage the neighbors property.

One thing, you hopefully have not had their claws removed. This is inhumane and needlessly cruel and painful for them. This is also probably one of the easiest ways to keep them safe, by allowing them to use what nature gave them for defense. Personally, I have clipped my 2 cats' claws with nail clippers every 2 weeks or so since they were kittens. This allowed them to get used to the sensation while they were still "young and impressionable" and has kept my furniture safe as well as them. Really, beyond that, you sort of have to take into account both where you live (city, which is more dangerous, or country) and the fact that even though cats have been domesticated through breeding over the millenia, they still retain enough wile and instinct to keep them generally safe on their own. Unfortunately, the one thing you cannot so easily account for are people. No matter how crafty the cat is or how sharp their claws are, they are never a match for things like cars. There is also a risk a feline leukemia, which is frightfully easy for them to acquire. But this, like most other health concerns, can easily be prevented if you make sure they are always current with their vaccinations. I have had cats in my life since I was born and, thankfully, all of them that have died have died of old age! In that way, I think cats are much smarter/luckier than dogs.

try and build a fence around your yard if the zoning laws allow you to.