Haven’t done the exact calculation but 12 out of the original 25 were in their 20s, then there are early 30s people too. So 60% under 35 can’t be far off.
A few “older people” in 50s-70s absolutely there as a token or (dare I say it) novelty.
I get that young people watch prime time tv and BBC need these audiences, but should the show be so blatant in this targeting / shouldn’t it better reflect the demographics of the country? Isn’t it outright ageism? I also think people with more life experience are likely to be more interesting in how they navigate the game.