As a Chinese it is a bit of surreal to see this event discussed here, because the story has already been too old (pun intended) on Chinese network. The whole "too old for tech jobs" is now moot, at least for ZTE employees, since the whole company may not exist anymore due to the American sanction. Now if you search for 中兴, the Chinese name of ZTE, all you find will be discussions about how China will fare in the upcoming trade war, and how China could have its own semiconductor industry.
ZTE imports most of its chips from the United States and its allies. Without these chips, it cannot manufacture the majority of its products. Its future is now unknown, and the stocks have stopped being traded.