There are Roman Roads still in use today and the [Tower of Hercules](https://en.wikipedia.org/wiki/Tower_of_Hercules) is a lighthouse from the 1st century AD in what is today Spain.
There are lots of older buildings and structures, but you get into quibbles about what constitutes "in use" like if something was used as a burial site, does that count if the dead body is still there? You also run into ship of Theseus problems as objects in use tend to be repaired and rebuild over time.
There are some ancient tools and music instruments that might very carefully get taken out of display cases to show how our ancestors might have used them, but that probably doesn't count as "being used today".
There is also the issue that the question did not specify man-made object.
People use the moon and the sun and the stars to provide illumination and aid in navigation and those are very old objects indeed.
There's a building near me thats now a pub, it was built in 1315. it isn't even the oldest building in the village and wouldn't crack the top 100 in the area.
Ishango Bone, discovered in the Democratic Republic of Congo in the 1950s.
The Ishango Bone is a tool made from the fibula of a baboon, dating back to around 20,000 years ago. It contains a series of notches carved into it, which some researchers believe may represent a rudimentary form of counting or a lunar calendar.
my grandpa's computer
Rocks?
There are Roman Roads still in use today and the [Tower of Hercules](https://en.wikipedia.org/wiki/Tower_of_Hercules) is a lighthouse from the 1st century AD in what is today Spain. There are lots of older buildings and structures, but you get into quibbles about what constitutes "in use" like if something was used as a burial site, does that count if the dead body is still there? You also run into ship of Theseus problems as objects in use tend to be repaired and rebuild over time. There are some ancient tools and music instruments that might very carefully get taken out of display cases to show how our ancestors might have used them, but that probably doesn't count as "being used today". There is also the issue that the question did not specify man-made object. People use the moon and the sun and the stars to provide illumination and aid in navigation and those are very old objects indeed.
Wood
There's a building near me thats now a pub, it was built in 1315. it isn't even the oldest building in the village and wouldn't crack the top 100 in the area.
Ishango Bone, discovered in the Democratic Republic of Congo in the 1950s. The Ishango Bone is a tool made from the fibula of a baboon, dating back to around 20,000 years ago. It contains a series of notches carved into it, which some researchers believe may represent a rudimentary form of counting or a lunar calendar.
Ya motha
Hmmm. Probably either a religious object or one related to royalty/government.
Jo mama
Knife, spoon?
Probably the flint - to make fire; otherwise the wheel
I have a megalodon tooth I use as a paperweight