UCI CYCLING REGULATIONS  continental championships (categories Elite/U23/ Junior) following the confirmation of  the change of nationality by the UCI.  In the case of a second change of nationality made under the letter c, and provided that  the rider has already participated in at least one of the events referred to in paragraph A  (categories Elite/ U23/Junior), the rider will not be able to participate in the next two  editions of the world championships and continental championships (categories  Elite/U23/ Junior) following the confirmation of the change of nationality by the UCI.  C. Participation in national championships is governed by article 1.2.028 of these  regulations.  D. The determination of a country that a rider can represent at the Olympic and  Paralympic Games is governed by the Olympic Charter and the International Paralympic  Committee (IPC) Handbook respectively. (text modified on 08.06.00; 01.01.04; 01.10.11; 01.05.14; 01.01.19; 05.02.19)  1.1.033  [article abrogated on 01.05.16] bis 1.1.034 For participation in events on the international calendar, riders' categories are  determined by the age of those competing as defined by the difference between the year  of the event and the year of birth of the rider.  (text modified on 01.01.05; 01.01.17)  1.1.034  For participation in events on the international calendar and national championships, bis  riders shall be required to hold a UCI ID.  1.1.035 Without prejudice to relevant legal provisions, only riders aged 17 or more to whom a  licence for one of the international categories below has been issued shall have the right  to take part in events on the international calendar. However, riders aged 16 or under  may take part in international BMX events (including BMX Freestyle events) and Para- cycling events if the applicable legislation does not prohibit it. Juniors (MJ: Men Juniors)  Under 23 (MU: Men Under 23)  Men  1.1.036 Youth  § 2  Categories of riders  Competitive cycling  This category shall comprise riders aged 19 to 22.  This category shall comprise riders aged 17 and 18.  This category denotes riders aged 16 years or under and is controlled by national  federations, except as provided for BMX and Para-cycling in article 1.1.035.  (text modified on 01.01.05; 01.01.17; 01.01.19)  (article introduced on 01.01.17)  13  GENERAL ORGANISATION OF CYCLING AS A SPORT  E0221 