“well into…”指“进入后期阶段”，“well into the future”就是“未来长期／未来很长一段时间”。​再比如“he is well into his 50s”需要理解为“他五十八九、快六十岁了”，即：If someone is well into his 50s, he is in his late 50s and probably turning 60 in the next couple of years.