Critical services in wireless networks opt for performance objectives depending on their application. For in-stance, the defined class of services Ultra-Reliable Low-Latency Communication (URLLC) in 5G networks targets machine automation applications and aims to achieve a high reliability during small latency. A second set of critical services, used generally in monitoring applications, where the receiver is interested in getting as fresh information as possible, aims to minimize the age of the received packets. In this paper, we study the transport of these two sets of services over unlicensed spectrum. We propose a transmission scheme which adapts the transmission power depending on the packet status, in order to achieve the target performance objective while preserving energy. We show that different objectives lead to opposite policies with either increasing or decreasing power levels with respect to delay.