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These laws are regulated by the states and vary widely:

Child Passenger Safety Laws in the United States, 1978–2010: Policy Diffusion in the Absence of Strong Federal Intervention

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3899584/#!po=1....

Remember getting stuck with the "hump" in the middle of the floor? I guess it was only a problem if you have more than one sibling and your parents had rear-wheel drive.

Maybe state dependent? I’m not yet 40 and recall being excited that I could finally ride up front when I turned 3.

At 3? You've got a damn good memory

Only a handful of vignettes from 3-5 but the excitement of riding in the front seat was enough to cement that one.