“When a rider turns 30, their career is almost over,” the statement read. “Therefore, we believe they should be rewarded with a special jersey given that it is exceptionally hard at that age. The maillot argent will be given to the rider that still manages to be somewhat competitive in the biggest race on the planet.”
https://cyclingmagazine.ca/sections/news/tour-de-france-to-debut-silver-jersey-for-riders-over-30/