Color

Color combinations for seniors: The colors used in the imagery and, especially, in control elements of the website must be of sufficient contrast, and developers should test their designs on black-and-white monitor to ensure accessibility. Also, allowing customizable interface (font size, colors, etc.) is also very favorable for the elderly. (я бы уже не согласился - практика показывает, что они этим не пользуются - МБ).

Colorize hyperlinks for seniors: When websites violate the guideline to use different colors to clearly distinguish between visited and unvisited links, seniors easily lose track of where they have been. We’ve certainly seen the same problem among all age groups: It's confusing when websites change the standard link colors, and it's particularly confusing when the same color is used for all links, whether or not you have visited the destination page. However, seniors have a harder time remembering which parts of a website they have visited before, so they are more likely to waste time repeatedly returning to the same place.

Hyperlinks and headings style for seniors: Differentiate between text used for linking and text used for headings. Throughout the site, present headings and links consistently. For links, use blue, bold, underlined text.

Contrast of hyperlinks for seniors: Use large text that contrasts well with the background for navigational elements. Consider a link’s color contrast both before and after it is visited.