A wearable device comprises first and second transmitting loops coupled with the wearable device. The first and second transmitting loops being further coupled with a data processing unit. Additionally, the second transmitting loop may be coupled with a sensor outputting a measuring signal. The first and second transmitting loops have a property with a readable value dependent on an aging of the object of a wearable device. In addition, the data processing unit is configured to measure the value of the property of the first and second transmitting loops and determine the effects or amount of aging.