great question! I have a hard time identifying roos before older than usual capon age. (and don't want to accidentally "caponize" a pullet)
Hope you get an answer soon!
Read the big long caponizing thread in this section. It has everything you could ever want to know. I forget the age, but it's all in there. It's long, but a good read.
9 weeks is not too old, but you do lose some of the benefits since they are already developing some roo-ish characteristics by 9 weeks. It's getting close to
too old' though. As they age the blood suppy to the testes gets more developed, and they can bleed out.
THanks, I am afraid by the time I get tools and nerve it will be to late to do this little guy. but I need to try on the next hatch, cause it is hard to find homes for roos. Wish someone near me did this. would love to learn with help on hand.