First of all, so long as your Will was validly executed under the law of the state in which it was executed it remain in legal effect no matter what jurisdiction you move to. That having been said, since your Will is 27 years old, you should consider an update. This may be advisable due to a new marriage, divorce, change of address, birth/adoption of a new child, a large change in assets, or a desire to include new beneficiaries or exclude old ones. An update can be accomplished either by executing a codicil (which amends an exisitng Will) which is used for minor changes or executing a new Will for more substantial changes.