ESPN ran a story called "NHL Power Rankings: Checking in on each team's 25 and younger core" This is the write up on the Sabres:
18. Buffalo Sabres
Previous ranking: 19
Points percentage: 55.36%
Next seven days: @ FLA (Feb. 24), vs. WSH (Feb. 26), vs. CBJ (Feb. 28), @ BOS (March 2)
Buffalo's stable of 20-something talents should be envied the league over. Owen Power (20), Mattias Samuelsson (22) and Rasmus Dahlin (22) patrol the Sabres' blue line well. Dylan Cozens (21) and Tage Thompson (25) will highlight Buffalo down the middle for years. Peyton Krebs (22) is still growing into his NHL role, and so are JJ Peterka (21) and Jack Quinn (21). And there's Ukko-Pekka Luukkonen (23), the goaltender Buffalo hopes is its No. 1 netminder for years to come.
I have no clue how they're only 18 on this list. Boston is #1 because of Charlie McAvoy, Pavel Zacha, Trent Frederic, and backup goalie Jeremy Swayman.