Before revision:  By making use of the Stochastic Hybrid System (SHS) method, we provide a derivation of the average Age of Information of a system of two parallel servers (with and without buffer capabilities) and compare the result with that of a single queue.
After revision:  By making use of the Stochastic Hybrid System (SHS) method, we provide a derivation of the average Age of Information of a system of two parallel servers (with and without buffer capabilities) and compare the results with those of a single queue.