You can actually see use of aged accounts in action: the recent storm of non-English spam submissions that was dumped into /newest (discussed here https://news.

You can actually see use of aged accounts in action: the recent storm of non-English spam submissions that was dumped into /newest (discussed here https://news.ycombinator.com/item?id=45956847 https://news.ycombinator.com/item?id=45956847) come from a mixture of newly created accounts but also some that have been around for several years with zero activity.