The 3 main age categories are Adults (16 years +), Children (4-15 years) and infants (Up to 3 years). Infants travel for free on all routes.
When travelling between Sweden and Denmark, young adults aged 16 & 17 may travel without a parent or guardian with a completed, printed liability waiver (from a parent or guardian) and a valid ID document.
On the Irish Sea routes, young adults aged 16 & 17 may travel without a parent or guardian aged 18 or over but must provide a letter of authority from a parent or guardian.