Eurail Pass: "Student" purchase: I turn 26 during my trip, do I purchase adult or student? I'm 25 when I buy.?

I am taking a Europe trip. Want to buy the Eurorail pass, but the rates have me confused. You are a student when you're 25 and below, but I turn 26 a few days before my journey begins. At the moment I'm 25, so which can I purchase? Will they make me pay the difference when I go to activate my pass? Or can I purchase "Student" pass since I'm 25 when I purchase it? Confused. Any clarification would be helpful. Thanks.Eurail Pass: "Student" purchase: I turn 26 during my trip, do I purchase adult or student? I'm 25 when I buy.?
What matters is your age on your first travel day. If you're 26 at that time, you cannot use a Youth Pass. See, for example, Eurail Global Pass Youth Conditions on the Eurail website:
http://www.eurail.com/eurail-passes/eura鈥?/a> . The same statement on the age qualificatin is also on the pges for the other pass types (Select, Regional, One Country).

You might find this website to be useful for researching train travel here in Europe: http://www.seat61.com/ . It includes links to the various national train websites where you can find schedules and prices for individual tickets and a huge amount of information on rail passes.