If you have substantial assets,

A well planned estate may be the best gift you leave your children. Without one, you can't be sure that your estate will go to the people and charities you'd choose.
Furthermore, unless you've protected your assets
from the impact of estate taxes, much of your estate will never
pass to your heirs because of estate taxes. Estate taxes alone
in some cases can consume a large portion or of your estate.
Estate planning can be a difficult process
for some people. The earlier you begin planning your estate, the
more options you will have available. While you prepare your own
estate plan, why not discuss the same with your parents or grown
children?
However whatever you do. Don't delay