Originally Posted by
love2pedal.com
I am 30 lbs heavier, 35 years older and about 5 mph slower. I will use the bike for 15 mile (or shorter) rides over rolling terrain. The bike will probably be about 20-21 lbs
Based on this information and assuming that you're still reasonably fit 67 gear inches is the right gear for you.
It's best if you started out around 70 and try different gear ratios.