Inflation has modified our perspective. The real value of fixed income drops dramatically during periods of high inflation like the early eighties. Now, nearly everyone needs a portion of their allocation in growth investments which can be expected to keep up with inflation. The percentage depends on monthly needs. Keep enough in income investments to secure your lifestyle.
Many advisors suggest thirty to fifty percent.
In each phase, take only the risk you need and know what you need. Your part is to study and make ready, then pray for guidance and establish godly priorities for His resources. Then you manage. He doesn't just describe four levels, he writes about them every month, including analysis of specific investment for each level. While the subscription is a good investment, much of the general educational information is available on the web site.