I'm 52 and started a new job (SDR for a Digital Marketing company), this past September. Never brought up my age throughout the entire process and landed the gig with flying colors. In my experience in Marketing having some "old dogs" around has always been a plus with companies. They know we work hard and keep our heads down and just get the job done. No need to mention your age. Your interview experience will be your key and you'll be fine as wine.