My husband (now ex husband) was arrested for domestic assault after pushing me so hard my head hit and broke a table. I didn't press charges at the time because I was afraid of him and under duress from his constant threats, emotional, verbal, and psychological abuse. Years later I was diagnosed with severe and complex PTSD. I've been in treatment and now finally have a voice. Can I press charges now even though it happened 6 years ago?
You can make a complaint to the police: they will decide if they want to investigate the matter.
Depending on which country/state you are in there may be a statute of limitations that means they cannot take action. Notwithstanding, unless there were witnesses apart from him and you this would be an extremely difficult case to get a conviction as there is unlikely to be any physical evidence or contemporaneous records - for this reason, the police may choose not to investigate.