Perhaps even longer. Arial dates back to 1982 and was meant as a metric-compatible lookalike for Helvetica which dates back to 1957, and is based on 1898's Akzi

Perhaps even longer. Arial dates back to 1982 and was meant as a metric-compatible lookalike for Helvetica which dates back to 1957, and is based on 1898's Akzidenz-Grotesk ; but of course at that time, filenames didn't yet have extensions.