The average lifespan of a budgie is generally 2-7 years.
Many factors can affect the lifespan on a budgie.
American budgies generally live longer than the larger English, and budgies that are used for breeding often have shorter lives than those who never raise chicks. Cuttlebone is the skeleton of the cuttlefish, and it contains calcium which is important to the health of your budgie. Other types of mineral blocks may be substituted for cuttlebone. However, it isn't harmful for a pet budgie to be offered grit once in awhile. I find that a much better substitute for grit is oyster shell.