The phrase "old fashioned concept" is correct and usable in written English
You can use it when referring to an idea, belief, or concept that is no longer widely believed or practiced in the present era. For example, "The idea of chastity before marriage is an old fashioned concept in modern society."
It starts with the old-fashioned concept of fairness.
"But that is a very old-fashioned concept.
Jerome Groopman has revived a simpler, more old-fashioned concept: "hope".
But he might consider embracing the old-fashioned concept of letting customers have what they actually want.
(Ages 8 and up) In her latest book, Babbitt takes an old-fashioned concept and gives it storytelling verve.
He added: "While I have the greatest respect for a sister faith, I believe that Hinduism without the old-fashioned concept of caste will be infinitely stronger.
While this may sound like that old-fashioned concept of delaying gratification, he said it had worked incredibly well with his clients.
It's like specialists are seen as an old-fashioned concept, and cash-strapped councils are being tempted to use unqualified workers.
That's an old-fashioned concept, but it would be nice to have real theater stars again, and "Man of La Mancha" is the kind of show that is designed to stand on broad shoulders.
Julia Raeside In Confidence is such an unflashy, old-fashioned concept for a show – host Laurie Taylor has a chat with his guest for 60 minutes – that it tends to choose participants who can handle an hour of sustained, intelligent conversation.
Still, when McNamee's lawyers first revealed that McNamee had turned over physical evidence to federal authorities, much of the attention was on the DNA issue; the issue of potential fingerprints — an old-fashioned concept compared to the high-tech nature of DNA testing — was largely ignored, except by bloggers.
