AntcuFaalb said:

I think it would be cool if Yoda was larger in his youth; appearing similar to the Namekians in Dragon Ball Z. The writer could write-in that his people naturally shrink with age.

This would allow him to fight with less... jumping. Also, it would illustrate that "size matters not" because the increase in wisdom (and oneness with the force) that comes with age would more than compensate for the decrease in height and brawn.

But he's only 20 years younger. That/s .02% of his lifespan between the PT and the OT. For a human, that'd be like aging about a year.