What investments are suitable for your parents depends on the type of investment accounts they currently have and what their sources of income will be when they retire. Are they relying on 401 (k) and IRA funds? Do they have pensions? Social Security? They need to plan their retirement income out and use some of the retirement calculators to see what makes sense. At their age, a more relevant forum would be early-retirement.org, where these topics are discussed in detail.