the distribution of an IRA account prior to age in equal amounts of a period of either 5 years or until the age of , whichever is the longest time period, without a 10% penalty. Taxes still must be paid on the distributions. Calculations using actual numbers Although the 4% initial portfolio withdrawal rate described above can be used as a rough gauge, it is often desirable to use a retirement planning tool that accepts detailed input and can render a result that has more precision. Some of these tools model only the retirement phase of the plan while others can model both the savings or accumulation phase as well as the retirement phase of the plan. For example, an analysis by Forbes reckoned that in 90% of historical markets, a 4% rate would have lasted for at least 30 years, while in 50% of the historical markets, a 4% rate would have been sustained for more than 40 years. The effects of making inflation-adjusted withdrawals from a given starting portfolio can be modeled with a downloadable spreadsheet that uses historical stock market data to estimate likely portfolio returns. Another approach is to employ a retirement calculator that also uses historical stock market modeling, but adds provisions for incorporating pensions, other retirement income, and changes in spending that may occur during the course of the retirement. Life after retirement Retirement might coincide with important life changes; a retired worker might move to a new location, for example a retirement community, thereby having less frequent contact with their previous social context and adopting a new lifestyle. Often retirees volunteer for charities and other community organizations. Tourism is a common marker of retirement and for some becomes a way of life, such as for so-called grey nomads. Some retired people even choose to go and live in warmer climates in what is known as retirement migration. It has been found that Americans have six lifestyle choices as they age: continuing to work full-time, continuing to work part-time, retiring from work and becoming engaged in a variety of leisure activities, retiring from work and becoming involved in a variety of recreational and leisure activities, retiring from work and later returning to work part-time, and retiring from work and later returning to work full-time. An important note to make from these lifestyle definitions are that four of the six involve working. America is facing