If someone filled out for funeral arrangements in 1999 would that contract still be honored now?

Unless the contract contained an out - like "this contract will be valid for 5 years from date", or "this contract will no longer be valid if the quoted price is less than 5% over the mortuary's cost to purchase", or something similar, it should still be valid.  However, after so many years, is the entity with which your grandmother signed the contract still around?  For example, if your grandmother signed a contract with x corp. in 1999, and in 2006 x corp. sold its assets to y corp., and went out of business, the contract is legally valid but practically unenforceable, because x corp. is no longer around to perform it or to pay damages for its breach.