Is there a tool out there that would allow the following functions:
* show the amount of Bitcoin that hasn't moved for 3 months, 6 months, 1 year, 2 years, 3 years, 4 years etc...
* show the amount of Bitcoin that hasn't moved since being mined.

I think this would be helpful to determine how many Bitcoins are actually available. For example, if there's about 6M Bitcoin that haven't moved for over 4 years, then they are effectively out of circulation. Whether or not they are accessible is irrelevant, as they are unlikely to enter the market at this point. If the owner didn't move them when Bitcoin was $250, they are surely not going to move them now. So we would know the actual amount of bitcoin we are playing with on a daily basis is about 5M