  We consider a multicast network in which real-time status updates generated
by a source are replicated and sent to multiple interested receiving nodes
through independent links. The receiving nodes are divided into two groups: one
priority group consists of $k$ nodes that require the reception of every update
packet, the other non-priority group consists of all other nodes without the
delivery requirement. Using age of information as a freshness metric, we
analyze the time-averaged age at both priority and non-priority nodes. For
shifted-exponential link delay distributions, the average age at a priority
node is lower than that at a non-priority node due to the delivery guarantee.
However, this advantage for priority nodes disappears if the link delay is
exponential distributed. Both groups of nodes have the same time-averaged age,
which implies that the guaranteed delivery of updates has no effect the
time-averaged freshness.
