Baby Boomers Beware: Target Date Funds Break With Safe Scholarly Guidance

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Summary

  • Most target date funds (TDFs) do not follow academic lifetime investing theory, exposing retirees to more risk near retirement than theory recommends.
  • Academic research and the Federal Thrift Savings Plan recommend 70–80% risk-free assets near retirement, but most TDFs are 90% risky assets.
  • TDF providers justify higher risk due to inadequate savings, but this contradicts the scholarly guidance they claim to follow.
  • Baby boomers should exit TDFs and move to T-bills and TIPS now, as a market crash could devastate retirement savings due to sequence of return risk.

Target date fund (TDF) providers say they follow the academic theory of lifetime investing. As human capital (present value of all wages) depletes, we rely more and more on our accumulated financial capital (our savings). That makes sense.

academic lifetime investment theory

Thomas Idzorek and Paul Kaplan, in 2024, revisited the findings of a 2007 article by Robert Ibbotson, et. al titled “Lifetime Financial Advice: Human Capital, Asset Allocation and Insurance.” In “Lifetime Financial Advice: A Personalized Optimal Multilevel Approach,” the authors recommend risk-free allocations near retirement be at 70%, a revision from Ibbotson’s previously recommended 80%.

The theory is very safe for people near retirement, allocating less than 30% to risky assets, as shown in the following excerpts from the two studies:

academic theory

The theory is put into practice by the largest savings plan in the world. The $1 trillion Federal Thrift Savings Plan follows a glidepath that puts it at 70% risk free at its target date.

$1 trillion federal thrift savings plan

However, the rest of the TDFs, representing $4 trillion in assets, do not follow the theory, even though they say they do. They are 90% risky at their target dates, with 50% in equities and 40% in risky long-term bonds:

TDF glidepaths