The purpose of this paper is to clarify the linkage between performance of the national team and that of the national youth team on football in Asia and make suggestions which should be useful from the operational viewpoint of the member associations of the Asian football confederation (AFC) .
    This paper examines the linkage between them for the 39 member associations of the AFC which participated the AFC under 19 championships between 1994 and 2008. Statistical analysis was made by means of correlation analysis and single regression analysis.
    With regard to correlation analysis, Spearman’ s rank correlation coefficient was found to be 0.763 and Kendall tau rank correlation coefficient was found to be 0.559. Both results show that there is correlation.
    With regard to single regression analysis, R-square was found to be 0.58. This shows that the performance of the national youth team was linked with the performance of the national team with regard to football in Asia to some extent.
    In the meantime, member associations of AFC were divided into four groups, based on performance of the national youth team and performance of the national team, and regression formula and practical suggestions were made for each group.

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    The aim of our investigation was to clarify the achievement situation and features regarding the experiences and results of players who take active parts in the highest ranked football leagues in Japan, Europe, and South American countries.
    The average age of players in J-League changed, showing an upward trend, and recorded a peak in the 2014 season (26.85 years), and was higher by 3.80 years than that of Dutch league, which had the lowest value. And in the generation category, the age composition ratio of J-League players showed the lowest values: U 17 (0.57%), U 20 (9.28%) and U 23 (15.34%). And regarding the appearance fraction ratio by age, J-League players also showed the lowest values: U 17 (0.02%), U 20 (3.43%) and U 23 (14.01%). Their U 30 value (78.94%) was near the lowest value－that of Italian league, and their O 31 value (21.06%) was next to the peak－that of Italian league.
    In other words, J-League showed lower levels of achievement by young players and a higher average age, in comparison to the leagues in other countries.
    One of the factor became clear was that the player production fostered by the "Japan Original System," in which players become professionals after playing at university, is an increasing tendency. Furthermore, other countries such as Germany value the appearance chances of the young generation players and strengthen the upbringing of young players in their own leagues. Thus Japanese players’ experience is behind the age schedule in comparison to other countries and this is having an influence on the clubs and the league, and on competitions with other Asian area teams, and on international matches.

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