First, you've got great speakers, and your system is likely very good.
Second, since you're still working, the issue is not likely that you're getting too much sleep, which research is showing can be detrimental to major organs. Eight hours/night is a good target for older folks.
Third, the suggestions to get a health check-up (once a year) and examine your lifestyle and activity level are very sound advice. Working from home can be very lethargic. Even just taking a walk around the block after lunch can be helpful. Hitting a gym 3 times a week would be fantastic. You'd be surprised how many older dudes are doing this to improve their quality of life.
Fourth, have your doctor check your PSA level. It's a simple blood test for prostate cancer. It's the second leading cause of cancer death among men, after lung cancer. Early detection can greatly improve survival rates.
Fifth, turn the volume up to concert level.