...Sorry for the late response.
Research has shown that he typical age for walking was 12 months, but the results ranged from eight-and-a-half months to 20 months. More importantly, there is little or no link between such early motor milestones and later development.
The following link is a great article explaining the above issues based on sound research. http://www.dailymail.co.uk/health/article-2304753/Why-shouldnt-worry-baby-starts-walk.html
Parents should only be concerned if walking has not occurred by 18 months</span>. In such cases, other developmental issues have usually arisen before this reported delay, signifying a more serious problem. The cited article should answer all your other questions!