High quality leather furniture can not just last a lifetime; it is also likely to improve with age if it is well cared for. The reason for this is that leather is a natural material and its inherent patina develops naturally as it ages.
This misconception is based largely on leather seats in cars which can indeed get uncomfortably hot in the summer and very cold in the winter. The same can not be said of domestic leather furniture as sofas in lounges and living areas do not have to face the same extreme temperature changes or spend all day languishing in direct sunlight in the way that vehicles do.