Sorry if a similar thread has been done previously, I couldn't find one.
The age indicated is that of the shooter at the time of the shooting:
Jame von Brunn, 88 in 2009, United States Holocaust Memorial Shooting - 1 death
William D. Baker, 66 in 2001, Navistar Shooting - 5 deaths
Kurt Myers, 64 in 2013, Mohawk Valley Shootings - 5 deaths
Stephen Paddock, 64 in 2017, Las Vegas Shooting - 58 deaths
William Cruse, 59 in 1987, Shopping centers spree killings, Florida - 6 deaths
Jeong Soo Paek, 59 in 2012 - Su Jung Health Sauna Shooting - 5 deaths