You should never delay implementing an estate plan simply because you may need to change it down the road. As long as you have the requisite mental capacity, you can always amend your estate plan as your life progresses.
When you are young, you may only need a Power of Attorney and Health Care Proxy to appoint agents to make financial and health care decision decisions for you if you become incapacitated. If you marry, begin to acquire assets, and have children, you will likely need a Will to appoint beneficiaries and Guardians for your children in case you and your spouse pass away while they are still minors. Later in life, tax planning or Medicaid planning with the use of a trust may become important. All of these documents can either be amended or revoked during your lifetime.
Do not wait until you think you have finally reached the “last phase of your life”. If a major life event occurs along the way, such as marriage, birth of a child, divorce, becoming a grandparent, inheriting large sums of money, or a health crisis, you can always change your estate plan. The best decision you can make for yourself and your loved ones is to create an estate plan based on your current needs.