I purchased a lifetime license 16 years ago for US $90. Indeed, the license I have is as valid as ever.
Startups are all the rage on HN but here is a great example of a lifestyle business that is long-lived and well-respected by many.
I'm a vuescan license holder since 2004. 18 years! I could have sworn I was using it 2 years earlier, though.
Good news: He has a "farmers continuity plan" - He gave birth to his successor. He now runs it with his son, who he raised as a developer :-)