Spent convictions and police disclosure
Most countries in Europe have a time after which certain convictions are considered spent or effectively never to have existed. This is to prevent one's potential career from being ruined by a small incident as a youngster.
In the UK for example, non-custodial convictions are spent after 5 years. Insurance companies and employers are not entitled to know about them and police vetting will not disclose them.
When applying for a job, your future employer will seek details of your history from the state in which you resided and it is the rules of the state you resided in which determine whether or not a previous conviction will be disclosed. For instance, in Ireland, certain less serious convictions are considered spent after 7 years. The same conviction would be spent in the UK after 5. So if applying for a job with and Irish company and you had a UK conviction 6 years ago, the Irish company would not be made aware of this by UK police. So effectively you would not have to disclose this.
So check with police vetting in the state that the incident took place. Check with the police vetting unit if you can contact them. Don't just pop into your local police station as they may not know and will just advise you to disclose.
Hope that helps! Best of luck!