The programme already offered face-to-face support in Glasgow, Sheffield, Devon, south Wales and the west of Northern Ireland, but it hopes the new service will allow it to reach adults anywhere in the UK through its website.
The service will operate between 10am and 4pm, Monday to Friday, and between 11am and 4pm at weekends. People will be able to make appointments to get personal support from trained professionals, the charity said.
Julie Breslin, head of Drink Wise Age Well, said: "As we age, life-changes such as retirement, bereavement or the children leaving home can leave some of us feeling more isolated and struggling to cope, which can lead to increased alcohol use.
"Over the past three years we have supported more than 85,000 people face-to-face, but there is demand for what we do in other parts of the country and web chat is a brilliant way to deliver convenient, confidential advice."