I recently bought samsung galaxy s2 off my friend. When I got the phone I did a factory data reset. When I try to log in to facebook app, it says "facebook authentication failed". When I tried to log in through the internet app, it said access denied and that the app is not suitable for under 15s and I need to verify my age. I looked everywhere but I couldn't find anywhere where I can enter my age. I tried to delete and install the facebook app again few times but it just doesn't seem to work. Any suggestions of how can I fix it?