We had poltergeist in our farm house; a ghost-hunter type person who came to look at it told my folks that this was a force field kind of thing generated in a household with a lot of teenagers, and since we had four teenaged girls (two of us 16, a 14 and a 12 year old) that was probably the reason for it. Two times after I grew up and left home I have seen that poltergeist work again: once when I was in the home of a boyfriend in Minnesota, when his dryer switched on by itself and then the door closed; once when he was at my house and my youngest sister was there to pick up something that had belonged to her late husband, when a small object moved straight off a shelf out about six or eight inches and then dropped to the floor. All three of us saw it. We were all in our thirties at the time but maybe that was a grownup poltergeist. Did you find out anything about that one of yours?
Nope, never did--but this was in an old, Addams-Family style hotel in a small, rural town in Arkansas, and I was ten, and not about to go back there to do any investigating (plus, I lived in a different town). This is the only time I can recall anything like this happening, but the memory is very clear.
No, wait--come to think of it, I can also recall a couple of times when I was outside and clearly heard my name being called aloud when there was nobody around to have done so.
And then there was that time when I heard the breathing sound in the empty corner of an empty room . . .
I think I'll stop trying to remember now.