I heard an interesting theory that was espoused on another site. When a person asked the question, "Should I take on so-and-so?" the other person answered much to the effect that one should know their own body mechanics and anatomy well before really choosing. They added in that fathers put children into martial arts at an early age, because they have yet to develop. I mean, it makes sense in a way, because the swimmer works different muscles than the dancer, and thus promote a different physical build.
Is that clear? If not, I can always reference the post. It was a lot more concise than I can be. Anyway, the question is, does this really have affect on the choice of martial arts for someone who has physically developed already? (Example, frail old man takes up inverted martial arts rather than external. That's rather extreme, but I hope it gets the point across.) Has anyone ever taken this into consideration? What are your thoughts on it? And are there articles that address this topic?