You ask it, we have it answered!

No, wills are perpetual by nature, which means once the person whose will it is (testator = male, testatrix = female) proofs and validates their will, it never terminates. A will cannot 'expire' and there is no restriction that limits the time a will is valid. The only way a last will and testament becomes invalidated is when the person whose will it is, revokes all previous wills in their current will. Even though your will may remain valid, however, remember that it may no longer be up to date and suitable for your needs. Your circumstances could have changed significantly since you drafted it. It is a good idea to review your will at least once a year, and after major life events, e.g. getting married, having or adopting a child, getting divorced, acquiring substantial assets not covered by your will, etc.