How you choose to invest will depend on a number of factors, one of which is how close you are to retirement. One common strategy is to be more aggressive with your investment strategy when you are years or decades away from retirement. This can possibly lead to higher overall returns while you have a long time to smooth out the ups and downs of a high-risk, high-reward strategy. Then, as you get closer to retirement, you start to be more conservative with your investments in an attempt to better preserve capital.