Actually it's one of those pieces that's not as hard as it sounds. I did it at quite an early age (and I was no prodigy!). It was my first Brahms -- the second was the B minor Capriccio IIRC.It's also a great way to test out the bottom note on a piano you're thinking of buying...
That's true, it isn't that technically difficult, but if you have trouble reaching an octave it may present some problems. I was thinking more of the interpretive subtleties that come with long acquaintance with these Brahms pieces. You are right, I think, that Op 79 no2 is not the most introspective of the late Brahms pieces, and it may lend itself pretty well to youthful interpretations. Teresa