Agree, although physical age doesn't always equal emotional maturity, i.e. the son may be more emotionally mature than his father. However, with that said, it is his mother who is missing, and therefore it should be the time for the husband to step up and face the media, etc. rather than having the young man who is certainly more attached to Karen than the husband is.
MOO
If they were in the process of getting divorced, why would anyone expect the husband to be the media spokesperson? After all, for all practical purposes they are not effectively married any more and the relationship is over. Allthough still married in name the only connection between each other is that they live in the same house, they are not living as husband and wife.
The son on the other hand would still have a familial relationship, so it is alltogether appropriate that he act as the spokesperson. IMO it would be highly inappropriate for the (soon to be ex) husband to represent her publically.