This from the Manchester Worlds Master Track Championships site:
UCI amend Championships Age Category Regulations
We are pleased to announce that the UCI have further considered the question of championships age groups and have amended these to include age groups for both men and women up to 75+ years.
Where the minimum numbers of entries per age group, 8 for individual events and 12 for group events, are achieved a stand alone championship will be held.
Where these numbers are not achieved an age group or groups will be combined with an adjacent group and one race held.
However, separate results will be published for each group and championship jerseys and medals will be presented even if there is only one rider in that age group.
The championships web site is currently being updated with this information.
This decision has to be formally ratified by the UCI Management Committee on June 20th.