Like many forum topics, the pros and cons of acceleration and early college have been discussed previously. Here are a few links to old threads:
1) Radical acceleration down the road - any regrets?
2) Grade skipping tradeoffs
3) Early Grade Acceleration
4) ACT and SAT at a young age

If a parent sees potentially immature behavior and/or lapse in judgement in their college-bound child, the parent may wish to have a direct conversation about the possible negative and long-lasting consequences if the child were to exhibit similar behavior in a college setting. In general, kids can be coached to take steps to think things through and make a conscious choice about their behavior.

I'm familiar with college students being fully matriculated at age 15 and successfully* earning an advanced degree while still in their teens. Therefore I will encourage you that it is possible for a highly motivated student to blend in seamlessly and never play the age card. In perspective, one year of acceleration seems relatively minor. It depends on the student and the opportunities available.

Parents with a child attending college early may wish to know that parental rights under FERPA end when a child turns 18 or attends college, whichever comes first:
Originally Posted by FERPA for parents and eligible students
Parents should understand that their rights transfer to the student when he or she reaches the age of 18 or attends a postsecondary school at any age. Students to whom the rights have transferred are "eligible students."

For a broad variety of reasons, some kids take a "gap year" and do not go to college immediately after high school. Among the free Guidebooks created by the Davidson Institute for Talent Development is a guidebook on planning a gap year, one on early college, one on mentors, and even one on volunteerism.

Here is a link to the college forum, as related topics there may be of interest.

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*Successfully earning an advanced degree while still in their teens, in this context, means: while keeping life in balance... enjoying stability with family, healthy friendships, ongoing long-term volunteerism, positive internship experiences. Ultimately upon graduation receiving multiple job offers utilizing degree, in area of study.