The problem is you haven't provided enough information to make a meaningful comparison. At 52, you're not old. The average age of local gran fondos is around 50. My avg speeds commuting are 28-32kph depending on wind and how I feel.

Some of the speed differences are due to rider capability but a larger component is generally due to the type of bike, tires and rider position. My guess is you are riding some type of a hybrid bike with 35+mm tires in a fairly upright position. Ride a race bike with 23mm tires in an aero position and your speeds will go up significantly.

At this point, attempting to compare your progress with others is not meaningful without a powermeter. Focus on increasing your riding time and the speed will come. See if you can work your way up to 10+ hrs/wk and you'll start to see where your potential lies.