Why did everyone roll up the bottoms of their jeans in the 50's?

Being born in 1946 I didn’t buy many of my own jeans in the 50’s.
I rolled them up because they were too long.
Lack of money made us much more practicle back then. Style be damned, there was nothing wrong with rolled up jeans. Also “gasp” hand me downs were quite common. Jeans were not thrown away because they were faded or had a hole in the knee.Mom just sewed on a patch.
Style was for the rich