Researchers are working hard to understand the mechanics of Alzheimer's disease and other forms of dementia. So, how close are we to finding a cure?

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Sources:
http://www.who.int/mediacentre/factsheets/fs362/en/
https://www.alz.org/alzheimers_disease_what_is_alzheimers.asp
https://www.alz.org/facts/
https://www.alz.org/alzheimers_disease_standard_prescriptions.asp
https://www.alz.org/research/science/alzheimers_treatment_horizon.asp
https://www.alz.org/research/science/earlier_alzheimers_diagnosis.asp#Biomarkers
https://www.alz.org/national/documents/topicsheet_betaamyloid.pdf
https://www.alz.org/dementia/down-syndrome-alzheimers-symptoms.asp
https://www.alz.org/alzheimers_disease_stages_of_alzheimers.asp
https://www.endalznow.org/studies/dominantly-inherited-alzheimers-network-trials-unit-dian-tu/washington-university-school
https://www.alzheimers.net/difference-between-alzheimers-and-dementia/
https://www.nia.nih.gov/health/what-happens-brain-alzheimers-disease
https://www.nia.nih.gov/alzheimers/clinical-trials/dominantly-inherited-alzheimer-network-dian
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5651419/
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4447057/
https://www.ncbi.nlm.nih.gov/pubmed/26721364
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4758551/
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4631710/
http://psychiatriapolska.pl/uploads/images/PP_4_2016/ENGver679Preuss_PsychiatrPol2016v50i4.pdf
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5524100/
https://www.ncbi.nlm.nih.gov/pubmed/23558483
https://www.ncbi.nlm.nih.gov/pubmed/26153970
https://www.ncbi.nlm.nih.gov/pubmed/25567624
https://www.sciencedaily.com/releases/2010/12/101214181932.htm
https://www.researchgate.net/profile/Kai_Hei_Tse/publication/317186790_Re-imagining_Alzheimer%27s_disease_-_the_diminishing_importance_of_amyloid_and_a_glimpse_of_what_lies_ahead/links/5982b859458515a60df80e14/Re-imagining-Alzheimers-disease-the-diminishing-importance-of-amyloid-and-a-glimpse-of-what-lies-ahead.pdf
https://www.ncbi.nlm.nih.gov/pubmed/23927914
https://www.ncbi.nlm.nih.gov/pubmed/20205644
https://www.ncbi.nlm.nih.gov/pubmed/27582220
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Images:
https://en.wikipedia.org/wiki/Alzheimer%27s_disease#/media/File:Alzheimer_dementia_(3)_presenile_onset.jpg
https://commons.wikimedia.org/wiki/File:Neurofibrillary_tangles_in_the_Hippocampus_of_an_old_person_with_Alzheimer-related_pathology,_immunohistochemistry_for_tau_protein.JPG#/media/File:Neurofibrillary_tangles_in_the_Hippocampus_of_an_old_person_with_Alzheimer-related_pathology,_Gallyas_silver_stain.JPG
https://en.wikipedia.org/wiki/Alzheimer%27s_disease#/media/File:TANGLES_HIGH.jpg
https://en.wikipedia.org/wiki/Acetylcholinesterase_inhibitor#/media/File:AChe_inhibitors_pic.jpg
https://en.wikipedia.org/wiki/NMDA_receptor_antagonist#/media/File:NMDA_receptor_activation_and_antagonists.PNG