29/11/2013 12:12 GMT | Updated 29/01/2014 05:59 GMT

Preventing HIV and Aids in Older People Across the World

Often characterised as a young person's disease, more older people than ever are living with HIV. New data from UNAIDS, the UN's main advocate for accelerated, comprehensive and coordinated global action on the HIV/AIDS epidemic, reveals that an estimated 3.6 million people aged 50 and older are living with HIV. For the first time since the start of the HIV epidemic, 10% of the adult population living with HIV in low- and middle-income countries is aged 50 or older.

Research from other countries reveals that this could be higher still within specific older age groups, for example data from a 2012 national HIV survey in South Africa showed that HIV prevalence was 13% among people aged 50-54 and 12% among women and 6.9% among men aged 55-59.

The reasons for this growth are multiple, including people living longer due to the success of antiretrovirals, along with more older people contracting the disease through unprotected sex in later life.

The former is a triumph for the scientific community's understanding of the disease, a result of nearly three decades of research. However, challenges remain in ensuring that antiretroviral medication reaches those who need it, particularly amongst older age groups.

We often hear that people aged 50 and over may not be promptly tested for HIV infection because doctors are less likely to consider HIV. Therefore, older people are more likely to be diagnosed only once they have developed an AIDS-related illness. This is particularly problematic because antiretrovirals are less effective the later they are administered. There is also a worrying lack of information about how antiretrovirals interact with other medications, something that is particularly relevant to older people who are more likely to live with chronic conditions such as diabetes and heart disease.

Others with HIV in later life will have contracted it through unprotected sex, not helped by HIV prevention programmes often ignoring or simply excluding older people. In addition, health workers may not consider testing older people for HIV because they do not think that older people are at risk - beliefs that older people themselves are known to harbour.

To tackle this and raise awareness about HIV, Age International runs awareness programmes through our partners across the developing world and we are urging other NGOs to think about older people when they run their prevention programmes. This work has the immediate benefit of informing older people about the risks associated with the disease plus ways to protect themselves and also a secondary benefit of older people passing on prevention tips to their children and grandchildren.

As we reflect on 25 years of World AIDS Day, we can celebrate many milestones. However, with more older people infected than ever before the fight continues to both ensure that more older people do not contract the disease in later life and that those who do have it, are given the best treatment possible.