Keep your cats indoors. I toured a cheetah habitation once, and the owner kept the the wild cats inside cages the size of a living room. Someone asked why they didn't have more room, to run around or explore, and he replied that big wild cats spend their entire lives, essentially, in the same, small amount of space. They don't romp around like dogs or wolves. So your cats will do fine in an apartment for their entire lives.
Also, it is their instinct to want outside. If you always keep them in, then they won't know what it's like to go outside, so they'll never miss it. But it is their instince to live outside, but they are safer and happier indoors.
Also, it is their instinct to want outside. If you always keep them in, then they won't know what it's like to go outside, so they'll never miss it. But it is their instince to live outside, but they are safer and happier indoors.