"Many have not taken adequate steps to review and update these plans since the moment they were signed. Meanwhile, major life events such as marriage, the birth of a child or the launch of a business may have occurred."
Estate plans are not a one-shot deal. They are like a snapshot of your life at a particular point in time. An old estate plan shows how your property and life circumstances looked at the time it was made. But things change over time, and so should your estate plan.
If you never change your estate plan, it might stop doing what you want. As Forbes points out, in an article titled “Why You Should Update Your Estate Plan,” if you do not update your estate plan when your life circumstances change, then you might be risking costly legal battles for your heirs. Significant property acquisitions that are not accounted for in your estate plan can lead to problems. Having additional children or getting divorced can cause problems, if you do not change your estate plan. Tax law changes could make your old estate plan ineffectual.