In another post someone included a link to Joplin's GitHub Download Stats.
I noticed that the first released version on the list was 0.10.19. This appeared on 20NOV17, four years ago today.
Just for the heck of it I downloaded that version and ran it in a VM. On the surface it still looks a bit like the Joplin we have now but when you look at what it can (or rather can't) do you can really see how far Joplin has developed over the past four years.