For large landfills, secondary liner systems are required to provide the subsurface additional protection from the contaminants. In this case, usually gravel is used as the secondary leachate collection system. This research studies different types of geotextiles, part of geocomposite drains (GCD), used as a replacement for gravel in a leak detection system between two liners. The GCD is often promoted as having the advantage of potentially reducing strain on the underlying layers, but clogging and long-term performance of the geosynthetics are still two big factors to be studied. The resistance of the geotextile that surrounds the geonet is crucial for that matter. The objective of this study is to investigate the service life of three geotextiles, all elements of GCDs, used for landfill applications. The studied geotextiles are needle-punched, produced by different manufacturers and with different mass per unit area. The geotextiles were immersed in simulated municipal solid waste leachate and incubated in ovens at four temperatures. Samples were taken at regular intervals and tests were conducted on the aged and unaged samples. Tensile and puncture tests were performed to assess changes in physical properties with ageing and standard oxidative induction time (Std. OIT) tests were executed to assess the rate of antioxidant depletion. Changes in the performance were measured by comparing the aged values to the unaged values. The initial evaluation of the apparent depletion in all temperatures for Std. OIT, as well as a rate of degradation in tensile and puncture tests, are reported. Using the Arrhenius plot for half-life property, the results led to a preliminary prediction of the service life of the geotextiles under landfill conditions.