Age of Information (AoI) measures the freshness ofdata in mission critical Internet-of-Things (IoT) applications i.e.,industrial internet, intelligent transportation systems etc. In thispaper, a new system model is proposed to estimate the averageAoI (AAoI) in an ultra-reliable low latency communication(URLLC) enabled wireless communication system with decodeand-forward relay scheme over the quasi-static Rayleigh blockfading channels. Short packet communication scheme is used tomeet both reliability and latency requirements of the proposedwireless network. By resorting finite block length informationtheory, queuing theory and stochastic processes, a closed-formexpression for AAoI is obtained. Finally, the impact of the systemparameters, such as update generation rate, block length andblock length allocation factor on the AAoI are investigated. Allresults are validated by the numerical results