I make the equivalent of 100k USD in a tier 2 city in Scotland (a single income that is, not a couple combined). It's not outlandish for senior roles across much of the UK (with "normal" companies, not FAANG).
100k is attainable even in the middle of nowhere in the USA, but you'd probably be better off working remotely for someone for 120k+
Looking at https://www.census.gov/data/tables/time-series/demo/income-p... (the "Married-Couple Families" section), the first data set ("All Races"), the numbers I see for median household income, by age, are:
25-29: $76.5k 30-34: $92k
30-34 is stretching the definitions of a "young couple", of course. I'd love numbers for 20-25, but this data set lumps in 15-24 all together, though the set of married couples under 20 is presumably pretty small.
$76k is still not $100k, of course.