Facebook is being overrun by silver surfers, and simultaneously abandoned by young users, according to a new report.
The number of users over 55 has grown by 513.7% in the last six months, but the site now has 16.5% fewer school users and 21.7% fewer university users.
Overall, the number of users is still growing, with nearly 72 million in the US alone. This is an increase of 70.8% in the past six months.
The figures were generated by internet marketing agency istrategylabs, which looked at the statistics on the social networking site's Social Ads platform.
The company said the figures appeared to back up speculation that younger users were becoming alienated by the site as more older people join.
It said in a blog post, "There have been rumors that these younger user groups are being alienated by their parents joining the service, and this data seems to prove it."