The federal government's Life Checks website has gone live, allowing over-45s to check their health and make "choices for a longer life".

The Life Checks website, which has gone live on Tuesday, enables users to make "choices for a longer life", Minister for Senior Australians and Aged Care Ken Wyatt says in a statement.

The website will give 10 million Australians aged 45 and over free advice on taking positive steps towards better health and greater security.

"We're already living 25 years longer than we did a century ago and we owe it to ourselves, our families and the nation to live the best we can," Mr Wyatt said.

The average life expectancy is currently 82.5 years and it is projected that by 2050, there will be more than 40,000 centenarians.

The website, part of the government's More Choices For A Longer Life measures, covers four areas: health, work, finance and social life.