我去过西敏寺，既没听说，也没见到这样一块石碑。
网上有人转帖了西敏寺网页上关于这个问题的答复：
Q:Is there an inscription of 1100 AD beginning "When I was young I thought I could change the world..."?
A:No, there is no inscription in Westminster Abbey which says this, even though it is quoted as such in a popular American anthology called "Chicken Soup for the Soul".
不过该链接已经失效，暂时无法确证。
