With the average life expectancy for South Africans at 60 years old, the country "has achieved a 'stunning' increase in life expectancy in the last three years due to a government push to roll out antiretroviral drugs (ARVs) to people with HIV/AIDS," according to a study (.pdf) published in the Lancet on Thursday, Reuters reports. Nearly two million of the six million people in the country living with HIV/AIDS are on antiretroviral treatment, compared with only 912,000 in 2009 when the life expectancy was 56.5 years, the news agency notes, adding that the country's treatment program is the largest in the world.