My guess is this is more your perception than reality. You are new to the group, so there may be reasons that you aren't aware of yet since you may not quite know all of the dynamics of the group quite yet; that can take some time.

Talk to the therapist about it if it's bothering you. The therapist may simply be giving you time to get comfortable. Remember, having a new group member is also a major adjustment for the other members and affects the entire group dynamic, so the therapist has to work to help everyone settle in to the new dynamic which may be why some of the focus is on those older members. You may not be aware (are probably not aware) of the individual issues with those individual members, but the therapist is.

Group is not always equal time for every member. That is something you will start understanding and adjusting to the longer you attend. The fact is that most sessions will somewhat focus on a few members; the other fact is that which members are of focus will change session to session depending on what is being discussed, etc. It isn't about favoritism; it is simply the way group dynamics work.