Since you don't know how old the parts are, it can't hurt to replace them. I have a weldless spigot on my sparge water pot that's 7 years old, seems to be fine.
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