Hi - Thank you for reaching out. Your questions are not uncommon among individuals who have had a loved one diagnosed with dementia, and I hope others will chime in with their experience!
While older age is the biggest known risk factor for Alzheimer's disease, Alzheimer’s is not a typical component of getting older. I am sharing an article here that discuss several potential risk factors and how genetics play into a diagnosis: https://alzheimersdisease.net/risk-factors and genetics
Are you concerned that you are at risk of having Alzheimer's? If so, is this something that you have spoken with your doctor about? Let us know if these articles are helpful!