"I did read a couple of threads here that basically said that if you are over 40, don't bother. I don't buy that."
and well you shouldn't. I don't have a whole lot to add to what's been said before, but I will say this: it's been a long time since I underestimated anyone's ability based on size, gender, demeanor, or, least of all, age.
"Among the many misdeeds of the British rule in India, history will look upon the act of depriving a whole nation of arms, as the blackest." (Gandhi, an Autobiography, M.K. Gandhi, 446)