Arsenal have a squad with young players and of course, I think that factor also has an impact on their mentality as well from time to time. Because after all, building a team to be strong in all competitions doesn't seem to only be about having young players. Because if the coach is not able to form the mentality of the players to become a winning mentality, then at least they will experience a decrease in performance from time to time. Thus, every player must have a winning mentality and excellent conditions, of course to be able to have consistent performance throughout the season.
Arsenal had selected the young player as compared to the other team,they had the youngest squad in the league.The Arsenal had change the team with younger players all the time,it’s their one of the strategy.They think building the team with the younger players will help to the best team,but some experienced players also placed in the team to handle the tough situation of the game.The coach of the Arsenal playing huge impacts in the team spirit and winning strategy of the team.The mentality of the coach and player should in the same manner to win the game.The coach should trigger the player to handle the tough situation and how to win at the last minute game.The potential of the players was totally depend on the team coach.
I don't remember Arsenal having any good success in the Champions League. Almost 20 years ago they played in the final against Barcelona and lost. Then a few years ago they played in the Europa League final against Chelsea and lost too. The younger the squad, the less experienced they are. So it seems to me that they will fail again this season.