This is the world's oldest plane still in production

[Gerald]

The Cessna 172, a light airplane popular for training pilots, has remained mostly unchanged for more than 60 years.

It was marketed as the "land-o-matic" because it is so easy to land. The robustness, reliability and versatility of the Cessna 172 has allowed it to clock up the longest production run of any aircraft in histiry.

http://www.bbc.com/future/story/2017...-in-production

This article would have matched our friend GR here but are eager to post something that I know.