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When you say seams separating do you mean from the fiberglass hull or where it actually holds air?
Zodiacs should be thermo bonded for the tubes themselves and tend not to suffer failure there. On the other hand anything glued will fall off over time. Like where the tubes attach to the hull, handles, and other glued on accessories. Regluing can be done, but it is slightly tedious, with removal, cleaning, and prep work being 70% of the job.
I highly doubt paying to retube an older model small boat is financially a good decision, as buying a newer boat or new boat would be about the same cost.
Hullabaloo
