The reason these answers remain unanswered is because nobody knows the answers. They are all using anecdotal evidence or loosely based research.

One researcher found that there is never a 100% recovery. There may be perceived 100% recoveries but those individuals will manifest symptoms when their brain is under stress.

There is no connection between vomiting and concussion severity. I never vomited after any of my concussions, including the one that left me unconscious for 30 minutes.

Your whole third paragraph is full of misunderstandings. You take as fact things that at best are only professional opinions and conjecture. In the vast majority of cases, the patient is considered recovered when they stop complaining and asking for treatment or have been allowed to return to play. The quality of life after concussion research is very weak although it does show that those with prolonged symptoms tend to have a noticeably lower quality of life.

What is the point of your question ? Are you trying to learn what your own prognosis is ?

The slow aging process does not effect the brain at anywhere near the intensity of a concussion.