A free presentation entitled “Alzheimer’s: Know the 10 Warning Signs” will be held in the Northborough Senior Center at 10:30 a.m. Monday. The session will detail why early detection matters, and the differences between typical memory changes experienced as part of the aging process, and the distinct memory problems caused by Alzheimer’s disease. An in-depth review of the warning signs will be discussed, along with tips to maximize memory. The Senior Center is 119 Bearfoot Road. For more information, call 508-393-5035.