There is no evidence whatsoever that age alone causes tone to improve in a violin.
Many things can change the tone dramatically including set-up, strings (kind and quality), sound-post adjustments, bridge, etc., so it is impossible to prove that age alone has any effect on tone, good or bad.
Suggestion: It would be really helpful if the time appeared above the AB loop sliders. In long videos, it is very difficult to set the sliders where the user wants.