I think overall it looks great, as others have said there is no age limit on tweed, or appropriate outfits, so do not worry about that. If you wear it where appropriate then you will look 100 times better than those that rent. I would say for the hose, Lovat Blue, Lovat Green, Maroon, Red, heck even Yellow would be infinitely better than black, you could also wear Charcoal however I would reserve those for a sombre occasion, a funeral for example. Now others have brought up the tie, I tend to wear a wool tie with my kilts, they seem to work well together, the colour you have is good though. Of course if you have a school or regimental tie then you could wear that. You said something about Argyll hose, I think in the right circumstance they can work very well with tweed. As below.