The font sizes that make older clients leave your website are anything under 16 pixels for body text. Presbyopia begins around age 40, and most professional services decision-makers are in that range, so small text is a conversion killer: they will not zoom, they will bounce to a competitor.
Presbyopia begins around age 40. By 50, most people need larger text to read comfortably. If your website serves professional services clients (dentists, lawyers, consultants, financial advisors), your decision-makers are typically in this range. Body text at 14 pixels is a conversion killer.
The minimum for body text is 16 pixels. 18 pixels is better for hero descriptions and key messaging. Keep 14 pixels only for labels, metadata, and supplementary information that is not essential to the conversion.
Users who strain to read do not zoom. They bounce. They leave your site and visit your competitor whose text they can actually read. Small text on warm backgrounds with muted colors compounds the problem because the reduced contrast makes every pixel of font size matter more.
Build your type system intentionally. Choose a mathematical scale ratio (1.25 for moderate, 1.333 for spacious) so each size step has a relationship to the others. Use fluid sizing with CSS clamp() so text scales smoothly between phone and desktop instead of jumping at breakpoints.
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Frequently asked
What font size is too small for older clients?
Body text at 14 pixels is a conversion killer. Presbyopia begins around age 40, and by 50 most people need larger text to read comfortably, so if your clients are dentists, lawyers, consultants, or financial advisors, your decision-makers are typically in this range.
What are the right body text sizes?
The minimum for body text is 16 pixels, and 18 pixels is better for hero descriptions and key messaging. Keep 14 pixels only for labels, metadata, and supplementary information that is not essential to the conversion.
What happens when users cannot read the text?
Users who strain to read do not zoom, they bounce. They leave and visit a competitor whose text they can actually read. Small text on warm backgrounds with muted colors compounds the problem because reduced contrast makes every pixel of font size matter more.
How should I build a type system?
Choose a mathematical scale ratio, 1.25 for moderate or 1.333 for spacious, so each size step relates to the others. Use fluid sizing with CSS clamp() so text scales smoothly between phone and desktop instead of jumping at breakpoints.
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