Would a younger cat (possibly kitten) or a more mature cat be a better choice in this situation? Please see details.

In March, we adopted Callie. She is three years old and is a wonderful part of our home. She has adjusted well and we love her personality.

Until Rishy’s death in November, we were always a two or three cat family. We’re ready to adopt again but we’re trying to figure out what age cat would be best to go with our girl. Younger, so she could be the “alpha cat”? Or older, more mature and potentially calmer and unconcerned with who is in charge? We don’t want to choose a cat that is a lot older than she is because we’re hoping that they will play together. (After an appropriate introduction period, of course.)

Other than age, if you have other advice on making a choice, I would love to hear it.