Table 1.

Number of riders and mean age in each season.

	MOTO 3		MOTO 2		MOTO GP
	Riders	Mean Age	Riders	Mean Age	Riders	Mean Age
2013	32	18,40	32	23,78	24	26,79
2014	33	18,69	35	24,13	23	27,17
2015	34	17,70	30	23,73	25	26,92
2016	33	18,45	30	23,37	21	26,62
2017	31	20,29	33	23,33	23	26,87