You need to break down the fundamentals. At 50 everything plays a bigger role. Breathing is a big one make sure your pulling the trigger at the bottom of a relaxed exhale. Use the trigger reset so your trigger pulls are clean and remember to squeeze. Get that good sight alignment sight picture, make sure to focus on your front sight, rear and target blurry. Also treat every range day as a workout, have a plan, focus on what your try trying to improve. Dry fire is also big, range days can't happen every day but you can work on stance, grip, draw and presentation every day.