  We consider a system of nonlinear partial differential equations that
describes an age-structured population living in changing environment on $N$
patches. We prove existence and uniqueness of solution and analyze large time
behavior of the system in time-independent case, for periodically changing and
for irregularly varying environment. Under the assumption that every patch can
be reached from every other patch, directly or through several intermediary
patches, and that net reproductive operator has spectral radius larger than
one, we prove that population is persistent on all patches. If the spectral
radius is less or equal one, extinction on all patches is imminent.
