A car from 1969 is perfectly usable for its intended purpose in 2017. It might not be as safe, clean, etc…but it can maintain highway speed, be reliable enough (if in good tune) to use as a commuter, etc.
OTOH, a 1911 car would have been “functionally obsolete” in 1969, let alone today. There’s roads you couldn’t take; you’d be hard-pressed to keep it functioning as a daily driver; you’d probably also need specialist training in how it operates to drive it safely (for example, often the rightmost pedal was a brake.)
Progress keeps on progressing, but at a reduced rate. It’s somewhat logarithmic; starts out steep and flattens out as the tech “matures,” but never stops entirely.