We're currently working a system that will have both a free (with verification limits) and a paid service.
https://www.oneverify.co.uk
Its obviously still in development right now but being tested on a couple of our own sites and shows promise.
Has standard facial recognition with government ID fallback as an option.
Would love to get some feedback on the test verification if you wanted to give it a try (especially the ladies on GFY, its primarily been tested with the guys at the office and a handful of women so we need more female faces to check it against).
https://www.oneverify.co.uk/clients/verify.php?c=gfy
Let me know how close +/- it was to your actual age if you give it a test
Theres a variance we have set to calculate younger the older you are that we're trying to fine tune to get within 3% of a persons age correct.