Hmm... most senior series.
Off the top of my head,
Formula 3 - 1950
British Saloon Car Championship - 1958
GTs as a category didn't surface until 1960-odd, so I suppose officially it's F3.
Mark you, I've got to take issue with the question over car preparation. I would suggest that there's a teensy bit more work involved in building up a racing car out of a Porsche 911GT3, a Ford Focus or a Peugeot 406 than phoning up nice Mr Dallara and asking him to fetch you a nice new single-seater off the peg.
But then I'm biased - I'm unconvinced by the "career ladder" theory of motor sport involvement, and I like big, scary sports cars. I also don't buy the idea that you're over the hill and past it by 23.
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