Since there is no information provided about existing retirement savings, I will assume that you (like most Americans) are behind in saving for retirement and will encourage you to save as much as you can afford over this period of time. Specifically, you should probably be contributing to tax sheltered retirement accounts, such as traditional or Roth IRAs, and/or employer-sponsored retirement accounts (401(k), 403(b),etc.), and you would do well to take full advantage of any employer matching contributions.
While research has shown that, beyond age 45, the amount of contributions often has a greater impact on the end value than investment returns, it is also important that you make sound investment decisions and keep investment expenses as low as possible. Although a discussion of investment possibilities is beyond the scope of my answer, index funds are often a choice that merits consideration.
Separately, since you are divorced and, presumably were married longer than 10 years, you should be aware of and keep in mind the role that social security may play in providing for your financial security. For more on this, see the following article links -
Planner: Benefits For Your Divorced Spouse (Social
10 Social Security Facts About Benefits For An Ex-Spouse(About.com)
You need to dump your hubby and
collect on your ex