The Gut Microbiota and Its Metabolites Contribute to Ageing and Ageing-related Diseases -- Ageing and human gut microbiome: the taxonomic and functional transition towards an elderly-type microbiome -- Ageing of the gut microbiome and its potential contribution towards immunesenescence and inflammaging -- Gut Microbiome and Virome: Anti-aging interventions -- Bile microbiota profile in ageing and age-related disease. .