At what age do people forget how to use teleportation?

I mean, I remember vividly that I fell asleep on the coach and woke up my bed. (Sometimes, this even happened miles away from home!)
Can't do that anymore.

@Walter Hinteler,
About 5 years old (give or take child's height and weight). The faster a child grows, the quicker the power is lost.

I think it's much older than that.

I can remember nights when I've been at the pub, and the next thing I know I'm in my bed and it's the next morning.

Don't know how that happened!

I remember once, when I was in my late teens, one minute being on a pub crawl around Richmond, then waking up in a houseboat on the Thames with a very interesting older lady cooking breakfast in the galley.

I wish I could remember more, really.