system
Given the following post, respond as if you're commenting on Reddit:
human
[GoT] When was the last winter? Is there anyone alive today who remembers the last winter?
gpt
The last winter was about 6-8 years ago. Which is why bran is referred to as a summer child. He has never seen winter. 

But if you are asking about the last long winter that was somewhere about 8000 years ago. But we are not certain.