I understand what you're saying and I can see why you'd think that, but it's helpful for me to think of Half Life like the videogame equivalent of Star Wars. Not being alive during the release of the first films doesn't preclude one from entering at any point and enjoying the continuation of the story. Even if they haven't played it, kids today know of Half Life as a first person shooter that changed how we play first person shooters, so they're a warm lead for the sequel/prequel.
Star Wars was never a thing outside of America. Even today, fans in China, who otherwise love their CGI heavy sci-fi, don't care much for Star Wars.
You really have to have been either a firsthand or secondhand part of that culture to appreciate Star Wars and similar IPs. Even if you didn't watch it when it was released, you probably heard everyone from your dad to SNL discuss it.
If that wasn't your experience growing up, I doubt you'll care much for it as an adult now
It was never a thing in India or China. That's about 40% of the world's population. Fair to say that it wasn't a massive thing outside America.
Compare the overseas gross of the recent Star Wars releases against a globally popular franchise like the MCU or Fast and the Furious. Despite the massive press and marketing push, Episode VIII was outgrossed by Fate of the Furious internationally by nearly $300M. Endgame outgrossed Episode VIII internationally by $1.2B.
If a crappy Vin Diesel starring franchise that's barely two decades old can outsell a cultural touchstone like Star Wars, it's not wrong to say that Star Wars isn't a big thing outside America
