The phrase "youthful side" refers to a person's or thing's characteristic or behavior that is energetic, fresh, or reminiscent of their younger years. Full definition
After their exploits last term, it established Spurs as the most impressive youthful side in the whole of Europe. (forzafutbol.com)
They are the most youthful side currently in the Premiership, with the exception of possibly Arsenal, and with youth often comes arrogance. (football-bookmakers.com)
Ollie Baines reflects on England's unusually youthful side and wonders whether Christians have the right attitude toward age More (premierchristianity.com)