First off, we have TWO people on the team who are over 30 (Ticha and Adrian). Ticha is 33 and Adrian is 31. They are far from being "too old".
Second, we have four rookies on the team ATM. In addition to those players, three others are still on rookie pay scale. That's seven young players. There's plenty of youth on the team. The younger players, save Kelly and Harper, aren't particularly consistent nor are they particularly good. Next year, a good number of them need to be replaced by more talented players. The more experienced players (you know, the ones you call "old") are carrying this team, and they are by far the most talented players on this roster.
This sounds more like an issue with personnel than it does with coaching. The head coach for this team is not in charge of personnel, so any concern regarding that matter should be directed at the general manager. Whisenant gave Boucek a weak roster, and the result of that is a weak record. Having said that, we are 3.5 games out of the top spot in the Western Conference. No need to panic.