Top 30 lines heading into NHL season The top line is each NHL team's lifeblood, and TSN Senior Hockey Report Frank Seravalli takes a look at all 30 top lines as the season is set to begin.

Frank Seravalli TSN Senior Hockey Reporter Follow|Archive

NHL head coaches seemingly change their line combinations as often as they change their underwear.

Every day, it’s something different. In fact, not one of the 30 top line combinations from opening night last October finished the 82-game slog as a trio. Players were traded, some were hit by injury and others slumped and were simply sloughed off.

Nonetheless, the top line is each team’s lifeblood, a representation of hope for a meaningful campaign. It is supposed to be a team’s bellwether.

In the NHL’s centennial season, it will be interesting to track how young lines are trending.

Seven teams will open the season with a top line whose composition averages 25 years of age or younger.

We have lines like Nashville’s Filip Forsberg - Ryan Johansen - Kevin Fiala, whose combined age is 66 years, or slightly older than Jaromir Jagr. There are plenty of others.

The NHL is a young man’s game, perhaps now more than ever, because of today’s emphasis on speed and skill, and salary cap concerns.

With a nod to those teams who do not have a clear-cut No. 1 line, here’s a look at all 30 top lines as they stood on Tuesday.