We consider a family of general branching processes with reproduction parameters depending on the age of the individual as well as the population age structure and a parameter $K$, which may represent the carrying capacity. These processes are Markovian in the age structure. In a previous paper (Proc. Steklov Inst. Math. 282 (2013) 90–105), the Law of Large Numbers as $K\to \infty $ was derived. Here we prove the central limit theorem, namely the weak convergence of the fluctuation processes in an appropriate Skorokhod space. We also show that the limit is driven by a stochastic partial differential equation.
"Convergence of the age structure of general schemes of population processes." Bernoulli 26 (2) 893 - 926, May 2020. https://doi.org/10.3150/18-BEJ1100