The recommended FIBA 3x3 age categories are 35+, open, U23, U18, U15 and U13; whereas U23 is treated like open for ranking points purposes.

Color level applicable to age for U-nn is individual driven in all events other than national team, i.e. a U15 playing in U18 gets points for U15 irrespectively of playing in a
U18 category.

For the specific rules, please read how the FIBA 3x3 Individual World Ranking works.