How long does a scuba BC last?
If the hose is sound with no signs of cracking, there are no leaks, buoyancy control is good and you service the inflator and dump valves annually after the first five years of use, then you should still have a reliable BCD.
How do you use BC scuba?
How much does a diving BC cost?
Check out our article, What type of buoyancy compensator BCD should i buy to learn more. BCD costs will range from the entry level of $350 and go up to almost $1500. The majority will fall in the $500-$700 range. The main differences you will find is the type of materials that are used to build the vest.