Lay magistrates are volunteer individuals aged 18-70 who work in magistrates' courts to listen to cases and deliver verdicts, requiring no legal background while receiving training. They deal with summary and either-way offences, with sentencing powers including fines, community orders, and short custodial sentences, while ensuring decisions serve the justice system appropriately. Magistrates also work in family and youth courts, where they directly interact with offenders, focusing on rehabilitation and the best interests of young individuals.