An 18-year-old male with ...

An 18-year-old male presented with complaints of short stature and delayed pubertal development, specifically the lack of beard growth. Despite measuring 5 feet 7 inches in height and weighing 56 kilograms, he displays minimal hair growth in the armpits and pubic area, as well as no facial hair. His penis measures approximately 5 cm in length, and his scrotal skin is lax and slightly pigmented. Although both testes are descended, they are small in size. What is the testosterone dosage for this patient? Is there any dosage formula for age?