Your team may include up to 10 children, and team members may participate on only 1 FIRST LEGO League team per season. All children must be between 9 and 16 years of age on the 1st of January of the season start. Limiting your team to 10 members may be difficult, but it is important to be fair to everyone by limiting the number of children on your team. If you have more than 10 children interested in joining your FIRST LEGO League team, please consider registering a second team or use a selection process to decide who may participate on your team.