I am looking to buy train tickets from Vienna to Salzburg and back to Vienna (all journey takes place on the same day, day trip). I found an Austrian website, but all the booking processes are in German, and I dont speak it.
Does anyone know of a place where I can get prices, schedules, and be able to find an option for tickets for senior citizens and youth fares? www.eurorail.com does not seem to have options for discounted tickets, just for adult fares of children fares.
Also, is there much difference to which train or class of service I book on that route? Thank you.

Here's the Deutsche Bahn rail site in English, which shows the Vienna-Salzburg routes. The schedule information is there, but not sure about your other requests.
http://reiseauskunft.bahn.de/bin/query.exe/e

Thanks Tim, i can find the timetable (which is extremely helpful), but I cant price any selections as these are for Austrian railroads, not for German. Thanks though!

reservations on such 'heavy rail traffic' routes are not necessary in Europe - except sleeper cars.

True, but I would really like to get the idea for the prices...and the difference in FC and 2nd class, and actually get that reservation. I found that its always good to have your seat reserved in advance no matter what

sorry, I don't know the online possibilities that AustrianRailways offers.

But you can get timetable informations, tickets and price informations through the swiss railway site (in english too):

http://www.rail.ch/index_e.htm

Travel / Timetable
http://www.rail.ch/pv/index_e.htm

Enter:
Departure: Vienna (it will be Wien Westbahnhof)
Destination: Salzburg
Travel Date: DD.MM.YYYY
Time: hh:mm Departure or Arrival

Start query

Click on order (2nd class)

Click on send request at the bottom of the page, to get price informations before ordering by email (in my experience they will answer in the next 24 hours, on working days). (the information there says: Please contact me before issuing the tickets and tell me the price/reservations. You'll get an answer to your e-mail as soon as possible.)

The fastet trains will take about 2 hours 57 minutes

for fare and schedule info www.raileurope.com is very useful. (hit the "point to point" button)

Thank you! Im trying to get the answer from the Swiss system.

raileurope actually charges extra for its services (I have delat with them before), and while they are helpful, I know that they are not offering the lowest pricest on the tickets. Thanks though!

instead of paying for first class, I mostly would buy a second class ticket and spend the money 'spared' in the dining car (open for both classes).

I do the same thing! The only notable exception are Italian and Eastern European trains, it does pay to get a first class seat on these as 2nd class may get crowded.

I am not very familiar with the Austrian railroads system, but I took a quick look at their online res system and found out that the full fare oneway Wien-Salzburg is 29 euro in 1st and 18.30 euro in 2nd class. Persons under 26 can get youth discounts, but I guess a special card from the Austrian Railroads is required for it -- maybe it is possible to get it at the station.

I agree with Rudi that there is no need to book a seat in advance for this kind of heavy traffic route. Just buy the ticket at the station when you get to Wien. Also I see no point in paying for first class on Western European trains.

IN ENGLISH:
http://www.oebb.at/english/index1.html
http://fahrplan.oebb.at/bin/oebb.w02/query.exe/en