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Goldman Sachs Innovate Equity ETF
stock NYSE ETF

I would be fairly aggressive personally.  At your age you have at least a 30 yr time horizon until retirement.  Me personally I would be 100% in stocks.  And I would be diversified using ETFs and while I agree with having exposure to indices like the S&P 500 I would personally have a larger than typical exposure to smaller cap and even some mid cap stocks.  You can get some of that exposure in ETFs like the Vanguard total stock market index ETF (ticker: VTI) I would have exposure to ETFs like Vanguard Extended Market Index ETF (ticker: VXF) or Dimensional US Small Cap ETF (ticker: DFAS).  Maybe some smaller exposures to sectors such as things like PSI, WTAI, XBI, GINN, etc.  But make sure you are comfortable with the investments you own and are willing to take a longer term investment perspective since many sectors or areas of the market like small caps may be more volatile day to day than broad based large cap stock indices like the S&P 500.  

I would be fairly aggressive personally.  At your age you have at least a 30 yr time horizon until retirement.  Me personally I would be 100% in stocks.  And I would be diversified using ETFs and while I agree with having exposure to indices like the S&P 500 I would personally have a larger than typical exposure to smaller cap and even some mid cap stocks.  You can get some of that exposure in ETFs like the Vanguard total stock market index ETF (ticker: VTI) I would have exposure to ETFs like Vanguard Extended Market Index ETF (ticker: VXF) or Dimensional US Small Cap ETF (ticker: DFAS).  Maybe some smaller exposures to sectors such as things like PSI, WTAI, XBI, GINN, etc.  But make sure you are comfortable with the investments you own and are willing to take a longer term investment perspective since many sectors or areas of the market like small caps may be more volatile day to day than broad based large cap stock indices like the S&P 500.