You can get faster but don't go looking for 270 to 280 off the tee because your current yardage is fine for 6300 to 6800 yards, given no wacky hole yardages like 260 yard par threes.
Consider getting a medium weight graphite shaft in your irons , say 80 -90 grams which will give you more speed and less fatigue at round's end; plus vibration dampening to prevent tendon damage. This is critical for longer range sessions and play in colder weather.
I just turned 78 so look at my Signature for guidance in the later years.
