just a brief note; I don't really think a more mature actor would have done a better job... as Brutus was about 36 in the year 49 BC. I could not find out how old Tobias Menzies really is but unless you think that people aged faster in ancient Rome than nowadays, a 36 year old still looks like a young boy compared to Pompey and Caesar... and actually, the actor playing Cato might be considered too old for his role!
And funny that you, Skarr, mentioned Hamlet, as Tobias Menzies just played the part at Royal Theatre in spring. (Tobias Menzies as Hamlet).