Any age-related macular degeneration in which the cause of the disease is a mutation in the C3 gene. The disease is Monarch Disease Ontology term MONDO_0012659 (age related macular degeneration 9). Also known as: ARMD9, C3 age-related macular degeneration, age related macular degeneration type 9, age-related macular degeneration caused by mutation in C3, macular Degeneration, age-related, type 9.