I started when I was 35
that said, you are 6'1" and ONLY 178 it wouldn't matter what age you were, you can't expect steroids to take the place of a good diet
you should EASILY be able to get to 210 NATURALLY if you just learn how to eat and be dedicated to eating the right way
steroids do NOT work magic or without PROPER nutrition as they require the right amount of calories in order to help you grow.
get to the diet section and read up on diets and bulking diets
give that a try first because at your age, you CAN screw up your natural hormones for the rest of your life, and its just not worth it