Hyperopia occurs when your eye is not deep enough compared to the corneal curvature (focusing power) or when the cornea is not curved enough, resulting in the light focusing at the back of the retina.
For younger people, hyperopic eyes are able to self-focus by making use of the zoom intended for reading, compensating for distance blur. As you get older, this zooming ability gets less strong, near vision becomes blurry first, before it affects far vision as well
Therefore, people suffering from hyperopia often require reading glasses before their 40’s. They also need glasses to see far (bifocal glasses) later in life.