I am supposed to write an essay 2 to 3 pages about Schaie's Stages of Development: Acquisitive stage, Responsible stage, Executive stage, and Achieving stage. What can be learned from Shaie’s stages of Developmental?
I am allowed to use for sources: book Discovering the Life Span, 3rd edition, by Robert Feldman.
Credible information from web sites: edu., org. and .gov sites: not allowed Wikipedia sites.