Pms 2017 (punjab) had age limit of 28 years
However, for Pms-2019 and onwards, this age limit was increased to 30 (for pms punjab)
In this way, anyone who was interested in appearing for pms in 2018 was therefore accommodated next year due to increase in age limit by 2 years (pms exams in 2018 did not happen of course)

Hope this addresses your concerns
Regards