You're not "a liar" you're just "wrong". Boston won the Cup in 2011 which is 12 years ago (comment was "ten") but we'll go with this year's squad:
Boston - Pastrnak, Bergeron, McAvoy, Marchand
2011 Kings - Doughty, Kopitar, Clifford, Brown, Voynov
2019 Blues - Tarasenko, Perron, Pietrangelo, Schwartz, Dunn
You don't start with a bunch of 28-33 year olds and ADD youth to that, you start with the youth and then ADD the O'Reilly, Schenn, Bozak (or Crater/Richards).
But it's the folly of looking at the past eight Cups and finding one that might fit the scenario, which it doesn't, and basing the entire strategy on that occurrance.
It's like looking at 2010 and thinking "the Flyers are really just thisclose!" and instead they are the 2011 Vancouver Canucks, the 2012 New Jersey Devils, the 2014 Rangers, the 2016 Sharks and 2017 Predators. Teams that "made the Final" and then receded from memory...