Depending upon if you're counting daily or regular usage, it looks like somewhere between 50+% (daily) and 75+% (occasional usage) of boomers are on facebook. The number for YouTube are a bit lower but not by much. For comparison, Tiktok, the Gen Z share is about 50%.

That is more than enough boomers being algorithmically swayed to alter an election. As has been shown (Cambridge Analytica, etc...) Facebook's segmentation arguably offers more power to target it's user than Tiktok does.