The YOG are for the world's young athletes aged from 15 to 18. Like the OG, they are held every four years, and are held in the same year as the OG with the Summer YOG taking place the same year as the Olympic Winter Games and vice-versa. Note that following the approval of Agenda 2020 by the IOC Session in December 2014, in the future the organisation of the YOG will move to an non-Olympic year, starting with the 4th Summer Youth Olympic Games, which will be postponed from 2022 to 2023.
The Summer YOG Nanjing 2014 gathered almost 3,800 young athletes, whereas the OG London 2012 welcomed more than 10,500 athletes.
The Summer and Winter YOG last 12 and 10 days respectively, while the OG may last up to 16 days.
The sports programme is based on that of the Olympic Games, with 28 sports for the Summer YOG and seven for the Winter YOG. However, the events are different, adapting to the age range and interests of the younger athletes. The YOG also include Learn & Share activities (known previously as Culture and Education Programme (CEP)).