There are two kinds of farsightedness: Presbyopia and Hyperopia.
Presbyopia is an age-related, decreased ability to see nearby objects, especially in low light. Everyone will become presbyopic, usually starting around the age of 40.
Hyperopia affects people of all ages and is where near and occasionally distant objects appear blurry. The hyperopic eye is slightly shorter than normal and is corrected with plus powered lenses.
Worldwide, an estimated 1.3 billion people had presbyopia in 2011. This number is expected to increase to 2.1 billion by 2020.