Not sure but my city refuses to tear some down old buildings for "historical prosperity. These aren’t even nice buildings, they’re all condemed generic concrete blocks.

Where I live, homes were still built of mud, bamboo and straw 40 years ago, so not much has survived. The oldest stuff around are the ruins of the cane sugar refinery, and that was built in just 1856. So no old stuff really

The oldest residential building is from 1550, but there is a church where the oldest parts are from the 11th Century.

1904, maybe? It’s the only one I know the age of. Maybe the court house is technically older, probably is, but it’s been overhauled a lot.

The oldest church was built around 1200, on the remains of an older church from the 7th century and you can go below ground to view those. We also have some Roman ruins from a castellum build around the year 47 you can also go and view.

Edit: The castellum is gone, but there are just some walls and stones.

Its very hard to find anything in the lower 48 and Canada (Your right, Mexico has a lot more preserved sites) that are older that 400 years old. I was recently out in southern Utah and there are petroglyphs around Moab, some depicting horses which dates them to no earlier than the mid-1600s. Others are believed to be significantly older.

Meaning Ive seen something in the US that is older than your mum. /s

Couldn’t tell you what the oldest building in my city is, but I assume it’s either an old house in what I assume is the historic district. That, or the clocktower in the downtown park that was once part of a transcontinental railway station.

On a couple side notes, I know I did a class field trip in elementary school to one of the old buildings (don’t remember much about it besides a service elevator that if I recall was just held by rope and wasn’t electric), which compared to other places in America is nothing considering I found out my city was founded around 1881. Can’t say I approve of the part where they fought the natives for the land, but history is full of horrid things so there’s no use dwelling on something you can’t change.

Our-dear-lady-church. Build circa 1250. Well preserved, still in use

In the city I live in, the oldest building is from ~1280. It was rebuilt quite a bit in 1767 though. It has housed restaurants since the 1930s. I pass it every day almost on my lunch walk :)

800 years.

Historians say the church was completed in the first quarter of the 13th century, that makes it somewhere between 799 - 824 years old.

The church in my town is from the early 13th century, and there’s a house from the mid 13th century. Both have been modified many times of course, but a lot of it remains original.

A church built in the 9th century, still in use today. Underground: Walls from the Roman empire, 2000 years or older. Dig deeper and you’ll find remnants of the stone age. Germany.

I’m sure there are older ones, but this one looks like someone left a few weeks ago even though it’s from the 1890’s. You can walk into it after a medium hike. There’s still soot in the fireplace.

https://californiathroughmylens.com/eagle-cliff-mine/

The really old stuff from the native Americans might be around but I’m not familiar with it.

I don’t live there anymore, and it’s not the oldest building, but there is a pub in Dublin that’s been running since 1198, they claim to be Ireland’s oldest pub but IIRC the claim is a bit bogus.

1845. And I live in the third brick structure built in the country and my house was built in 1857. Good chance Abraham Lincoln has been in my house.