> I personally find the US setup where often the longest serving and oldest workers would be earning the most, strange.

Isn't the US significantly more meritocratic in this regard than other large economies? I.e. compared to Europe or Asia it would seem that Europe has much more rigid comp rules, Japan has formal mechanisms to ensure that older people are paid more. And this is a tech forum obviously where i.e. the right ML engineers are making 7 figures + right now in their late 20s.