Yeah, but that's because muscles grow very fast, and strength increases fast. The people with thick fingers etc.. from a lifetime of hard work have thickened tendons etc.. and also the apparatus that holds the tendons down has thickened, etc.. and so forth.
Of course it varies for everyone, but if you'd spent decades doing it you'd get thicker fingers. But you'd have to be doing something that specifically stresses the fingers a lot.
And yeah this is an old thread but what the hey