Main problem is job naming. For e.g. some companies you can be a "manager" with just 40k while in others a manager can be 400k esp if regional or global responsibilities.

If you just leave school or first 2 years of working, no. of years working can still be good proxy. But for mid careers the progression will be so diverse that you just going to get a meaningless "average" or a very wide range like in the guides.