20+ is technically correct.

NC State was celebrating 40 years of CS in 2006 or so and they weren't the first. CS degrees have been around since the 1960s, so 50+ years at this point of CS as a separate degree program in the US. Apparently Cambridge offered their first CS degree in 1953.

Yes, but they took quite some time to spread to the whole country and to every major university. That didn't really start until the 70s and 80s (in line with when NC State got established).

My graduate school's CS department is older than the university it now belongs to.

Woah there, I was studying computer science in college 20 years ago and it wasn't even close to a new degree program then.

Too be fair, when I say 20 years ago I'm thinking "the 80s", then I remember that's wrong and I'm old.

Manchester University has had a CS department and degree since 1965:

https://www.cs.manchester.ac.uk/about/history-and-heritage/

I switched my major from 'business' (yawn) to comp sci 35 years ago (1986).. at my school, it was previously a 'concentration' in the Math department, which meant you got a BS in Math, concentration in Computer Science. It wasn't a full Bachelors of Science degree until about two years before I got there.

My father (RIP) got his Masters degree in CS-EE from MIT in 1972, almost 50 years ago.

I think you are kidding. Even my southern noname university had cs degrees 40 years ago. We had 3, one that was computer engineering, one in arts & sciences, one in the biz college