The NSW government is urging young people to take the COVID-19 pandemic seriously as the state's death toll reached 16.

The NSW government is urging young people to take the COVID-19 pandemic seriously, revealing more than a quarter of the state's current coronavirus cases are in people aged under 29.

Health Minister Brad Hazzard told reporters on Sunday that NSW recorded 87 new cases, bringing the state's total to 2580.

Of those, 565 are people aged under 29, while a total of 105 cases are in people aged under 19. Three people in their 30s have been put on ventilators in intensive care.

"I keep hearing messages that young people think this isn't going to affect them ... it can affect young people and it is currently affecting young people," Mr Hazzard said.

"Take it seriously is my message to young people ... if you don't take it seriously for yourself when you hear those statistics, you should be taking it seriously for your friends, your family, the community.

NSW Health confirmed four more people have died people from COVID-19, bringing the state's total to 16 deaths.

Three men who died - aged 76, 80 and 91 - were all passengers on the Ruby Princess of which a total of 622 passengers onboard have tested positive including 342 NSW residents.

The fourth recorded death was a 61-year-old male at Hornsby Hospital.

The Ruby Princess - linked to the loss of 11 lives across the country - will dock in Port Kembla, near Wollongong on Monday.

The cruise ship will likely spend up to 10 days docked for medical assessments, treatment or emergency extractions of the crew, NSW Police say.