Not too young at all. Maybe even the right age. However, I wouldnt be too worried if he has a bad test to start off. THose young bulls need to "clean out their plumbing" some to get an accurate test. If he has tow or three bad tests then I'd worry.
No he's not. There are a lot of bulls that are tested at (or before) 12 months of age. There are many bull sales in January through May up here, and a lot of those bulls are just coming up to a year of age in Jan-Mar. They are all tested before they are sold.