Yellowing in paper is a combination of factors, primarily cellulose content, acidity, and exposure to light, heat, and air. Decent bond paper from the 1980s will generally look just fine if it's stored in a dry box. It has a low acidity and will normally have a higher dag content do will age more slowly.

Exposing it to sunlight and/or excessive heat will cause it to age. If it's high cellulose paper, like a newspaper, it will generally yellow quickly regardless of the storage because newspaper is cheap and acidic and not intended to last.