list of world cups and world championships for juniors and youth 

Statements about this table:
the age group for the big league world series be for those age 16 - 18
the world junior table tennis championship be hold one time per year for those 18 and younger
u - 19 cricket world cup be held every two year
big league world series be the competition name with an age group of 16 - 18
the u - 19 cricket world cup be hold one time every two year
sport
competition name
competing entities
age groups
held every
aquatics
fina world junior swimming championships
individuals
17 or younger
two years
athletics
iaaf world junior championships in athletics
individuals
18 - 19
two years
athletics
iaaf world youth championships in athletics
individuals
17 or younger
two years
badminton
bwf world junior championships
individuals
19 or younger
one year
bandy
bandy world championship u - 23
nations
under - 23
two years
bandy
bandy world championship u - 19
nations
under - 19
two years
bandy
bandy world championship u - 17
nations
under - 17
two years
bandy
bandy world championship u - 15
nations
under - 15
two years
baseball
world junior baseball championship
nations
under - 18
one year through 2000 , now two years
baseball
world youth baseball championship
nations
under - 16
one year through 1998 , two years starting in 2001
baseball
big league world series
communities
16 - 18
one year
baseball
senior league world series
communities
14 - 16
one year
sport
competition name
competing entities
age groups
held every
baseball
junior league world series
communities
13 - 15
one year
baseball
little league world series
communities
13 or younger
one year
basketball
fiba under - 21 world championship
nations
21 or younger
four years until 2005
basketball
fiba under - 19 world championship
nations
19 or younger
four years until 2007 , now two years
basketball
fiba under - 17 world championship
nations
17 or younger
two years
basketball
fiba 3x3 u - 18 world championships
nations
18 or younger
year
cricket
u - 19 cricket world cup
nations
19 or younger
two years
figure skating
world junior figure skating championships
individuals
13 - 19
one year
football (soccer)
fifa u - 20 world cup
nations
20 or younger
two years
football (soccer)
fifa u - 17 world cup
nations
17 or younger
two years
ice hockey
iihf world u20 championship
nations
20 or younger
year
ice hockey
iihf world u18 championships
nations
18 or younger
year
sport
competition name
competing entities
age groups
held every
lacrosse
under - 19 world lacrosse championships
nations
19 or younger
four years
rowing
junior world rowing championships
nations
18 or younger
year
rugby union
irb junior world championship
nations
20 or younger
year
rugby union
under 19 rugby world championship
nations
19 or younger
year
rugby union
under 21 rugby world championship
nations
21 or younger
year
speed skating
world junior speed skating championships
individuals and nations
19 or younger
one year
speed skating
isu junior world cup speed skating
individuals and nations
19 or younger
one year
sailing
isaf youth sailing world championships
nations
under 19 's
annually
sailing
isaf classes world championship
held in the optimist , splash , zoom , rs tera etc
19 or younger
various
table tennis
world junior table tennis championships
individuals and nations
18 or younger
one year
volleyball
men 's junior volleyball world championship
nations
21 or younger
two years
volleyball
boys youth volleyball world championship
nations
19 or younger
two years