Our boy is three. We bought him at a year old as a guard for our poultry - with the intention of having him castrated, but our vets are not at all keen on llamas, for castration or otherwise. He shares the field with one pet castrated tup, a small gelding, and several male castrated goats, plus the two intact billy goats when they are let out in the field, and some female goats too, so he has plenty of company, but I am sure a female llama would be of more interest to him.
As I still want to have a llama for guard purposes, I have considered selling our intact one - to the right home - and having a castrated male instead. Its finding the right home, which must be experienced of course for an intact male.