I read Colin Wilson’s book The Outsider in 1980, when I was 20.
By that time, the 1950s existentialism Wilson was steeped in when he wrote the book had come back into fashion. Not in literature, but in pop music. The Cure and Josef K were citing Camus and Kafka, Magazine were citing Dostoyevsky, and so on.
Wilson’s 1956 hairstyle would also have fitted perfectly into 1980 photographs of groups like New Order and A Certain Ratio.