Can Suzhou Dushu Lake Church enter under age now?

Of course. Official website of Suzhou Culture and Tourism Bureau shows that Dushu Lake Church in Suzhou is open from 9:00- 16:00 from Monday to Sunday. As long as you can enter during this period, there is no age limit, so Suzhou Dushu Lake Church is accessible to minors. Suzhou, referred to as "Su" for short, was called Gusu and Pingjiang in ancient times. It is a prefecture-level city under the jurisdiction of Jiangsu Province and one of the important central cities in the Yangtze River Delta determined by the State Council.