The advisor will waive a portion of the fund's management fee equal to the expenses attributable to the management fees of American Century-advised underlying funds. The amount of this waiver will fluctuate depending on the fund's daily allocations to such funds. This waiver is expected to remain in effect permanently, and it cannot be terminated without the approval of the Board of Directors.

The value and/or returns of a portfolio will fluctuate with market and economic conditions.

The performance of the portfolios is dependent on the performance of their underlying American Century Investments' funds and will assume the risks associated with these funds. The risks will vary according to each portfolio's asset allocation, and a fund with a later target date is expected to be more volatile than one with an earlier target date.

International investing involves special risks, such as political instability and currency fluctuations.

Investing in fixed income securities entails interest rate, credit and price risks.

Historically, small- and/or mid-cap stocks have been more volatile than the stock of larger, more-established companies. Smaller companies may have limited resources, product lines and markets, and their securities may trade less frequently and in more limited volumes than the securities of larger companies.

Generally, as interest rates rise, the value of the bonds held in the fund will decline. The opposite is true when interest rates decline.

Please see the prospectus for details about sales charges.

The gross expense ratio is the fund's total annual operating costs, expressed as a percentage of the fund's average net assets for a given time period. It is gross of any fee waivers or expense reimbursement. The net expense ratio is the expense ratio after the application of any waivers or reimbursement. This is the actual ratio that investors paid during the fund's most recent fiscal year. Please see the prospectus for more information.

Investor Class Shares: Minimum initial investment is $1,000 for IRA and CESA accounts, and $2,500 for non-retirement accounts, but these minimums are waived with an initial investment of at least $500 per account and automatic investments of at least $100 per month. Non-Retirement Accounts: If your account balance falls below the minimum, or if you cancel your automatic monthly investment plan prior to reaching the minimum, American Century Investments may redeem the account and send the proceeds to you. Prior to doing so, we will notify you and give you 90 days to meet the minimum or reinstate your automatic monthly investment plan.

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For detailed descriptions of indices or investing terms referenced above, refer to our glossary.