Can a concussion as a kid cause problems 30 years later? if so what?

Post concussion: Post concussion syndrome can last for weeks, months and usually ceases by a year thirty years is a long time for a concussion to have any effect.

Controversial: Most experts had believed that concussion effects almost always abated after 1-2 yrs at most. Perhaps the impact of returning vets with tbi has raised questions and adding to that controversial issue the question of student (or pro) athletes suffering in late life. So, now there are studies that do appear to support this serious concern. http://www.medicalnewstoday.com/articles/256518.php read it.