No, this statement is false. According to Schaie and his colleagues' longitudinal studies, meaningful cognitive impairment does not show up until the age of 60.
At what age does cognitive decline start?
According to a study that was just published on bmj.com, cognitive function, which refers to the brain's memory, reasoning, and comprehension abilities, can begin to decline as early as age 45.
What kind of study is a longitudinal study?
Studies that track specific individuals over an extended period—often years or decades—use continuous or recurring measures.
Why is longitudinal research important?
Researchers can study dynamic ideas rather than static ones using longitudinal data. Knowing how people transition from one circumstance to another is crucial (for example, through work, poverty, parenthood, ill health, and so on). the relationship between early circumstances in life and subsequent results.
Learn more about longitudinal research: brainly.com/question/13045209
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Unique, useful, and wonderful
        
                    
             
        
        
        
The Ghana empire ruled before  great empires of Mali and Songhai,
Explanation:
The two empires of the region , along with Ghana were the last great owners of the Saharan Africa before colonialism and had been there for a long time thus. 
They were profiting from the trade routes set up in the time of the rule of Mansa Musa
This is the time of the precedence of the Ghana empire in the whole region which then broke up into small pieces and then the  great empires of Mali and Songhai sprung up after it. 
 
        
             
        
        
        
The answer is: B - Twenty-five percent of the active ingredients in cancer drugs are exclusively rainforest plants.