How can I tell how old my house is?

Public records are exactly where to start, and yes, that information is available. Your county property appraiser's website is the easiest source. Search your address and you'll find the year built, square footage, lot size, and assessment history. This is public information and it's free. If the county records aren't detailed enough, check with your local building department for permit history. Permits will show when the home was originally built and any additions or major renovations that were done over the years. Your title company or the title insurance policy from when you bought may also have historical information. The deed history can show when the property was first conveyed and to whom, which gives you a timeline. For older homes where records are sparse, a home inspector or contractor can often estimate the age based on the construction methods, materials, and systems. Knob and tube wiring, plaster walls, certain framing styles, and original plumbing materials all point to specific eras of construction.

Best resources are County recorders office or county assessors office. Or you could pull a preliminary title report with the title company.

Your local County should have the appropriate records in relation to your property.

Traditionally you would look at the tax records. The issue with tax records is they only go back so far. You may also need to research the age via Deeds registered at the county courthouse.