When do people go senile?

Senility, often associated with cognitive decline and memory loss, is commonly linked to aging, though it is not a normal part of aging. Conditions like Alzheimer's disease or other forms of dementia can lead to senile symptoms, and these typically manifest in older adults, usually after the age of 65. However, cognitive decline can also occur in younger individuals due to various factors, including medical conditions, trauma, or substance abuse. Early detection and intervention are essential for managing symptoms and improving quality of life.