That statement is true
To be more precise, they have been most susceptible to criticism for overemphasizing discrete age-linked stages.
Discrete age linked stages refers to the assumption that human would experience a certain level of development as we got into a certain age.
The problem with this is that people develop at a different rate. The development that happened to people is influenced by many factors such as intelligence level, environmental factors, personal experience, etc.
Because of this, theories of human development faced a lot of criticism. They overemphasize how much age influence the development that occurs to people.