Dogs and cats age at a faster rate than humans although some humans manage to remain emotionally immature for decades. Generally, cats are in their prime from 3 to 7 years old. After that, they mature and become senior cats.
In many cases, cats get better health care than their owners so make sure your feline friend continues getting regular checkups even if you need to skimp on your own checkups. After all, it won’t do you much good to live longer if you can’t enjoy your cat at the same time.