While I realize the power of compound interest is real, those at 45 can get into commodities trading in IRAs. ETNs allow people to short or long a commodity. Paying attention to the tax forms helps reduce end of year non business related expenses. I personally prefer this for 25% allocation to high risk because these markets are more rational. You can tell why oil will go lower. You might not get it perfect, but you can ride both ways by listening to NPR. This can speed up the interest compounding because you can ride both sides.