All people living in a city are entitled to a card after reaching 65, guaranteeing them discounts on most of the city's public transport services. Census records from 1990 show that 2,450 of the city's residents turned 64 that year, but in 1991, more than 3,000 applied for and reasonably received discount cards. So it is clear that part of the city's population growth between 1990 and 1991 must have come from people in their 60s migrating to the city.
The assumption that the city's total population grew by more than 500 during the 1990s is the basis for the above discussion.