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by pbhjpbhj 3054 days ago
Let's assume 25% of the USA population is on Facebook (2.2B of ~8B in the World apparently are, it's probably higher). So we have about 80M USA FB users. About 40/320 or 1/8 are in the 20-24 age group; but they're more likely to be represented on FB, so let's say 1:6 of USA FB users are 20-24.

So, back of the napkin we can expect around 13M/5 or ~2.5M Facebook users to age out of the under-25 age-group in USA in a year. It's around the same ball-park.

Disclaimer: I'm recovering from flu.