at least 3 years old, bc I can remember my 4th birthday party. probably 2 though bc I remember some things from when my sister was a baby and she was born 2 years after me...
I can't remember anything from before the age of 6. And then I've like a gap of no memories between 7 and 9 year old me. To be honest, anything before the age of 10 is just very vague when I try to remember it