Share your insights or perspective on the financial matter presented in the input.

Accepting high volatility for high long-term returns
This is basically what financial advisers have been saying for years...that you should invest in higher risk securities when you are young and lower risk securities when you get older. However, despite the fact that this is taken as truth by so many financial professionals, financial economists have been unable to formulate a coherent theory that supports it.  By changing the preferences of their theoretical investors, they can get solutions like putting all your investments in a super safe asset until you get to a minimum survival level for retirement and then investing aggressively and many other solutions.  But for none of the typically assumed preferences does investing aggressively when young and becoming more conservative as you near retirement seem to be the solution.  I'm not saying there can be no such preferences, but the difficulty in finding them makes me think maybe this idea is not actually correct. Couple of problems with your intuition that you should think about: It's not clear that things "average out" over time.  If you lose a bunch of money in some asset, there's no reason to think that by holding that asset for a while you will make back what you lost--prices are not cyclical.  Moreover, doesn't your intuition implicitly suggest that you should transition out of risky securities as you get older...perhaps after having lost money? You can invest in safe assets (or even better, the tangency portfolio from your graph) and then lever up if you do want higher risk/return.  You don't need to change your allocation to risky assets (and it is suboptimal to do so--you want to move along the CAL, not the curve). The riskiness of your portfolio should generally coincide (negatively) with your risk-aversion.  When you are older and more certain about your life expectancy and your assets, are you exposed to more or less risks?  In many cases, less risks.  This means you would choose a more risky portfolio (because you are more sure you will have enough to live on until death even if your portfolio takes a dive). Your actual portfolio consists both of your investments and your human capital (the present value of your time and skills).  When you are young, the value of this capital changes significantly with market performance so you already have background risk.  Buying risky securities adds to that risk.  When you are old, your human capital is worth little, so your overall portfolio becomes less risky.  You might want to compensate by increasing the risk of your investments. EDIT: Note that this point may depend on how risky your human capital is (how likely it is that your wage or job prospects will change with the economy). Overall the answer to your question is not definitively known, but there is theoretical evidence that investing in risky securities when young isn't optimal. Having said that, most people do seem to invest in riskier securities when young and safer when they are older. I suspect this is because with life experience people become less optimistic as they get older, not because it is optimal to do so.  But I can't be sure.