Many men are not comfortable in leading public prayers and I believe that they fall back on "memorized" wording. I admire men that are uncomfortable but still carry on and do the best that they can. I still get "dry mouthed" at times and the words fail me. As we get older, our minds do not function as rapidly as they used to. I was called on recently to deliver a sermon on about two hours notice because the preacher became ill. This was a challenge for me but I was able to complete the lesson. I really was caught off guard at the evening service when again the preacher became ill and I had no notice at all but again I was able to complete the task. I was at ease after beginning but my knees sure tried to fail me as I approached the pulpit.
All this being said, we are not given tasks beyond that which we are able to endure. Whatever way that the truth is presented is acceptable even if sometimes that we "memorize" certain words to convey our thoughts.
Just something from "the older generation"!!