Low temperatures can be a problem, but most of the time the problem will be not reaching the target gravity because the yeast goes dormant. Very long ferments (with an ale yeast) can develop a musty flavor. If it tastes okay at this point, it's good.
Remember one unassailable statistic, as explained by the late, great George Carlin: "Just think of how stupid the average person is, and then realize half of them are even stupider!"
"I would like to die on Mars, just not on impact." Elon Musk