Describe major changes that occurs on the neurological system associated to

 
Describe major changes that occurs on the neurological system associated to age. Include changes on central nervous system and peripheral nervous system.
Define delirium and dementia, specified similarities and differences and describe causes for each one.
Submission Instructions:
Your initial post should be at least 500 words, formatted and cited in current APA style with support from at least 2 academic sources.