I'm my own personal opinion and experiences it does not exist for it to work the person must believe all is set and in that case we have no free will and if everything is allready predetermined why are we continuing to live so o it does not exist. Alsoit would go against all laws of nature to speed up ageing on one thing or person would be EXTREMELY dangerous for one stray thought during the casting could destroy all near it if it was a real type of magic
You cannot control time in any way. It's not possible in the physical plane but it may be possible in altered states of consciousness through meditation, visualization, and other techniques. But I have yet to find conclusive evidence of it.
Even if it were possible, you would probably only be able to view your past and future since it's a very personal experience.
You cannot change what has happened in the past and you cannot 'fast forward' time into the future. You can only live in the present which will become your future.
What you can do is control your perception of time. If you pay attention to the time more often and learn to use it more efficently, you will be able to get things done a lot more quickly.