21.
in my back yard with my best friend out of an apple pipe, it snuck up on me, once i stood up from my chair it all washed over me, and when i was walking into the house it felt like i was a tiny alien in a giant man machine and i was like controlling it as i walked along, was pretty trippy. been doin it ever since, so about 2 and a half years. didnt start buying my own bags untill about a year ago though