We're also 9 years away from the end of the last recession. The longest we've gone without a recession in the past 100 years is 10 years.
Australia has not had a recession since June of 1991. That simultaneously does not mean they can go another two decades without a recession next time, and it does not mean their expansion has to end shortly. There's no rigid guide that the US expansion has to end anytime soon just because ten years was the longest expansion in the prior century. Perhaps this one will last 19 years and set a new benchmark, who knows (…
Could we double or triple the length between recessions? Sure, but I doubt it.