I'm 56 and retired. One thing that I've noticed at our range is that the older guys (myself included) don't like company. I tend to get to the rifle range before sunup. I have my targets up and ready to shoot at first light. There are several older guys who do the same. I almost always have the range to myself. If there is anyone else there it is one of the older guys.
We are finished and gone before the younger guys show up. Since I'm retired I can be pretty flexible. If I get there and there are more than 1-2 others, or if others show up, I just leave and come back another time. I notice the other older guys do the same. I'm sure it gives the appearance of a lot fewer old guys shooting. There are probably fewer of us, but I see the same old guys there a lot. It is always a different crew of younger guys.
I see a lot more older shooters at the shotgun areas. That is more of a social event than rifles.