<prompt> Human: My Roth 457 retirement plan is set to aggressive investments. Should I change it to conservative until all the Greece and China drama blows over?Im 28 years old if that matters.  <response>: Market timing doesnt work, not now, not ever. If current events are causing anxiety about your investments that is a sign that your asset allocation doesnt match your risk tolerance. You should adjust accordingly, otherwise you are at high risk from yourself when theres actually a market crash. 