I was curious so I looked around a little bit
Apparently the oldest stone tools found that can be attributed to hominids, are around 3 million years old: https://en.wikipedia.org/wiki/Oldowan.
When only counting Homo sapiens, they have found tools that are around 315.000 years old: https://en.wikipedia.org/wiki/Jebel_Irhoud.
And that's just what we have actually found :)