The idea of bridges being 'life expired' isn't quite as silly though - a
lot of bridges built in the early 20th century have in fact reached
their 'end of life' due to a combination of poor maintenance and
increased traffic levels. While it was customary to have '100 year
design life' mean 'forever', the designers did assume that the structure
would be properly maintained and that the loading would be broadly similar.
There have been notable bridge failures in both the Americas and Europe
that came down to lack of maintenance and age.