When I re-read my post I noticed that my whole thought with the post was kind of left out, so I just want to clarify that the point I tried to make out of all that blablabla was: How do YOU feel wearing it? That's what matters. Do you feel/think that it looks too "young"? Then it might not compliment your look, and you might not end up comfortable wearing it, and that will show.
But if you think it looks great on you and you feel confident wearing it, that will shine through and you'll rock that bag better than any 22 year old out there ever will!