Very true. I'm sure there is data if someone did a bit of a deep dive, but those high level stats are usually just too broad to be of true value alone. On the flip side, it is also likely, though, that most older folks have lower annual mileage - ie no commutes or driving the kids all over - so their rate may be worse than it seems. Add in "fault" and it becomes a different focus for discussion as well - since I've luckily avoided far more accidents than I've had, and I didn't stop too often to calculate old vs young driver almost wrecking me.
I do remember coming home after a blizzard on I-81 in TN or SW VA, and the interstate was a SINGLE well plowed lane but with 3+ feet of snow to each side. As all the traffic slowed to a stop, I looked in my rear view mirror and noticed a car behind NOT slowing to a stop. I reacted by turning towards the snow bank and trying to get as far right out of the way as possible. BOOM - nailed in the back driver side and driven into the snow bank. The engine compartment completely filled with snow(!) and the car stalled. Anyway, cop gets there shortly after, and is talking to the driver who hit us. "I didn't even see them" was his excuse. He was older. Conditions were clear, the road was straight, and there were a dozen plus cars stopped on the highway ahead of us. This was pre-cell phones being common (1994/5), so other than futzing with the radio or heater, not a lot of distractions. He should not have been driving.