Your house may not be able to talk to you, but nevertheless it gives you signs when something’s not right. A home’s windows are particularly communicative. Although they don’t last forever, high-quality, well-maintained windows could last for 20 years or more, but there are many factors at play. (Windows in a coastal city like Charleston, SC, might age faster than they would in Los Angeles, CA, for example.) If your windows are more than a few decades old, listen carefully to what they’re telling you, so you’ll know when they need to be replaced. Here’s what to be on the lookout for.