The roadworks has no connection to the story but is merely to set the scene and to emphasize that you can pick up the most useless pieces of trivia no matter where you happen to be! Apparently if you add the LAST TWO DIGITS of your date of birth to the age you will be NEXT birthday it will come to '101'. Now I tried this with several people I know and it was always correct. For example, if you were born on say 1 June 1961 you will be 50 next birthday. Add 61 to 50 - what do you get - 111. Peculiar isn't it?
I confess that I have not tested this out on more than a few people - so I will now sit back and wait to hear from anyone who can tell me that it doesn't work for them. I think it is interesting so please give it a try.