Ya, me too. Seriously, what is the deal with this horn?
If the part you broke is horn, yes. As someone who worked with a lot of materials like that, I can guarangoddamnedtee that anything organic, esp horn, bone or ivory, becomes more brittle with age (barring fossilization or partial fossilization). Some people say certain woods get harder, which is sort of true, but its actually the capillaries contracting and most woods tend to split over time unless oiled regularly. If the horn was what broke I'd recommend replacing it with sambar if possible, which tends to be less brittle than most other horns, if not as pretty.
If it was the silver, one of two things probably happened, either A) there was a fault in the casting or B) there was a stress fracture, either a result of prolonged use in one area (silver work hardens, and the harder it is the more brittle it gets) or it had been broken before and someone soldered it back together well enough that you couldn't see it, which if its .995+% sterling is possible, albeit incredibly difficult.
Re: Cock Kosherosity, I believe (human) cock is kosher in a heterosexual context provided seed is not spilled outside teh vajjin, please correct me if I'm wrong and you're so inclined, Stitchela.