The over-50s age group are seeing increasingly high levels of HIV diagnoses.
Figures from the Health Protection Agency found that instances of the disease rose from 299 new cases in 2000 to 710 new cases in 2007.
The study looked at diagnoses in England, Wales and Northern Ireland.
Genevieve Edwards, communications director at the Terrence Higgins Trust, commented: "Up until a few years ago people with HIV weren't expecting that they would be getting old.
"Now the fastest growing group of people with HIV in the UK is people over 50 and there are real issues around aging and HIV."
She added that people living with the condition will be subject to "twice as many long-term health conditions" as people without the illness.
At a recent International AIDS Conference, the World Health Organisation (WHO) called for HIV treatment to begin as early as possible following diagnosis.
The WHO made estimates that the HIV-related mortality rate could be reduced by as much as 20 per cent between 2010 and 2015 by implementing early treatment guidelines.