The approximate life of a concrete retaining wall could be between 50 – 100 years, though the National Concrete Association estimates it at 75. This will greatly depend on the quality of installation and the condition of the site. The soil it is built in and the materials used to construct the project, are key to ensure a proper foundation is beneath the wall and water has been addressed. The next factor is how water is being directed away from the wall. Water that pools above or within the wall adds pressure to the project and over time may, at a minimum, wash out the base materials which will weaken the wall and limit its lifespan. But by following the Allan Block installation guidelines, any project should perform for many years.