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NEW YORK ( TheStreet) -- Stocks are all about the future, not the present, Jim Cramer reminded his "Mad Money" TV show viewers Thursday as he hosted the show live from the business school at Villanova University in Philadelphia. Cramer said that while there are many things to worry about in today's market, young investors should be thinking about the markets of 2020. Cramer's "buy and homework" portfolio for 2020 needs to focus on long-term macro trends such as curing diseases, something at which U.S. biotech stocks thrive. He suggested picking up Gilead Sciences ( GILD - Get Report) or Celgene ( CELG - Get Report) to fill the first slot in the portfolio. Cramer said social media and cloud computing will likely be strong in 2020, which is why owning Google ( GOOG - Get Report) or Facebook ( FB - Get Report) should be next on the list. There's also America's race towards energy independence, something that Cummins ( CMI - Get Report) or Enbridge ( ENB - Get Report) can do for investor portfolios along with Noble Energy ( NBL - Get Report) or EOG Resources ( EOG - Get Report). America is also great at manufacturing, said Cramer, which is why the 2020 portfolio also should have Caterpillar ( CAT - Get Report), Boeing ( BA - Get Report) or Honeywell ( HON - Get Report). He also advised investors have a little gold in their portfolios for diversification. Finally, Cramer said his 2020 portfolio should include something international, such as the iShares MSCI Mexico ( EWW - Get Report) ETF. For speculation, he suggested US Airways ( LCC) on the heels of its merger. Last but not least, something local such as mortgage insurer Radian ( RDN - Get Report). Cramer said younger investors shouldn't wait, because even a few dollars a month into a portfolio like this one will have bountiful yields in the future.