@Sexnotgender
Interesting. This is actually from a vet but does it apply to humans too?
Puberty initiates a release of hormones that help close the epiphyseal plates on long bones. Absent this signal, the long bones grow beyond their intended length and interfere with the normal size and mechanical relationship between bone and joint.
From this article about the skeleton of a castrato, it seems that it does also apply to humans.
www.nature.com/articles/srep28463/
Even if all these skeletal markers confirmed the advanced age at death of Pacchierotti (81 years old), the epiphyseal lines on the iliac crests were visible (Fig. 3). These lines usually are fused at 23 years old and no more traces can be found in 90–100% of over 35 years old males.
Castrati were usually tall, with a large barrel-shaped chest, infantile larynx, long, spindly legs. Pacchierotti’s bones confirmed these characteristics, in particular the height, that was estimated measuring femurs, tibiae and humeri length and gave a value of around 191 cm.