Now imagine Yoda saying that to The Doctor, who IS that old and still looks handsome.... This is excellent artwork. It always bugged me that, for whatever reason, Yoda had hair when his species is clearly some kind of weird reptile, but...whatever. Your talent is quite evident; this is a beautiful piece.
Heh, yeah, that would be an interesting meet and greet. As for the realizm of his character.. well, that is not nearly as bad as some of the many other logic fauxpas the series is known for, but that's fantasy/sci-fi for ya, gotta take the good with the bad