After 19 years covering the stock market for USA TODAY, Adam Shell gives his best advice on how to successfully invest in the market. USA TODAY

There are many types of investors in America. Whether you are in your 20s or retired, it is important to know what strategy is the best fit for your portfolio.

Investing strategies start to change for investors when they get up into their 50s and 60s, as the retirement age starts to become a future reality rather than a distant blur.