timo,
Have you ever drank older wines? There are some people who don't like the characteristics of an aged wine and prefer their wines young. Of course, the only way to know is to drink them and find what you prefer.
Most older vintages will come with a premium price considering a wine shop has been storing them for years and that comes with a cost (electricity, storage space etc). Not sure where you live or if you can get them shipped but you can also try
www.wine-searcher.com
But before you store your wines for 10+ years or spend a lot of cabbage on older vintages, I would try to taste a few older ones, you may like your wines with only 5 years of age. It's all subjective....and fun :-)