30's not an issue - at least it wasn't for me. I just realized I'll be 37 next year. I'm not really closer to 40. Now that's weird. I'm glad I am planning to do a sprint triathlon, or something cool, so that I don't feel too old. Of course, I'm having knee issues and am not "allowed" to run right now while I'm in physical therapy. I'm hoping I can still run by 40. Maybe I am old already.
I'm sure you'll do fine with the 30's. You can accomplish a lot during this decade.
