glory days
noun /ˈɡlɔːri deɪz/
  /ˈɡlɔːri deɪz/
[plural]- a time in the past which people look back on as being better than the present
- The last time they won the Cup was back in the glory days of 1989.
 
Extra Examples- The team's glory days were in the 1980s when they won three European Cups.
 - We remember the team's glory days in the 1960s, when they won the World Cup.
 - Quarterman's glory days are long behind him.