Wade D. Pfau
As individuals age, the traditional historic approach to portfolio construction has been to reduce equity and other "risky" investments and increase fixed income investments. In a simplistic illustration, some use the following rale of thumb: Subtract your client's age from 100 and the result is the amount that should be invested in equities, with the balance invested in fixed income.
Freedman, Mitchell, "Comfortable Aging" (2015). In the News. 397.