Yep, just one golden age per Civ. The manual says it and it is also my experience.
I am not sure how big chances are for a GA, yet I play mostly with the Indians and the War Elephants generally trigger the GA. Also at what is IMHO a suitable moment, since I am about to build Sistine Chapel (1st wonder worth going for) and work on Forbidden Palace is going on. Both projects benefit enormously from the 20 turn boost.
Playing Bab and having a mid stage GA seems a bit unpractical since your UU is Bowman, which requires Warrior Code. So, either do not use your Bowmen or have an early GA.
I am not sure how big chances are for a GA, yet I play mostly with the Indians and the War Elephants generally trigger the GA. Also at what is IMHO a suitable moment, since I am about to build Sistine Chapel (1st wonder worth going for) and work on Forbidden Palace is going on. Both projects benefit enormously from the 20 turn boost.
Playing Bab and having a mid stage GA seems a bit unpractical since your UU is Bowman, which requires Warrior Code. So, either do not use your Bowmen or have an early GA.