When to Age?

[Esbeen55]

Relatively new to wine appreciation, I am wondering what factors in a wine suggest to you that it will age well, or at least improve with age? I've noticed some vintage charts suggest "drink now" or "save" but I suspect this varies a lot with particular wines? I am particularly wondering if some reds from Argentina's 2002 vintage are better stored for awhile, while others can be enjoyed now. Thanks for your suggestions in advance.