[Tainnor]

Calculus has changed a lot since 1700. Newton and Leibniz didn't have formal definitions of limits (or alternatively, something like non-standard analysis) readily available.

In terms of content, probably not much has changed in at least the last 50 years, though. Typesetting has definitely improved (old maths texts from before TeX are a bit hard to read), but I'll agree that a text from, say, the 90s is probably just as adequate as one printed today.