Q: I am thinking about getting a new kitten. I already have one male cat who is approximately 6 years old. Would he react badly if I got a female 2- to 3-month-old kitten?
I usually do not recommend pairing a kitten with an adult cat, although there are always exceptions. The age discrepancy between your adult cat and a kitten can be a challenge. Your 6-year-old resident cat is not as active as a kitten. Kittens, by definition, play incessantly, whereas adult cats prefer napping in between moderate to small amount of playtime.
Your resident cat might enjoy and bond with a new cat. If your resident cat has a history of successfully living with other cats, then he will probably do fine with a new friend, as long as you introduce your cats gradually to each other. Every cat is different. Some would rather remain the King and Queen of their households and are not willing to share their people and their territory with other cats.