You can estimate a building’s age in many ways. Are its structural panels OSB? It’s probably pretty new. Are the electrical receptors non-polarized? The house is probably older than you are. Are the nailed squared rather than rounded? The house might pre-date America. The year of construction might be printed on the meter reader or toilet in relatively new homes. Even the house style can be a clue to its age, you just need to read up on your architectural history. Look at at our new article on ways to determine the age of a building.