Ridax's solution would allow you to control the iPod with the B&O remote. It would connect to either the AUX input connection, or to the TAPE 2, so Van's suggestion would give the best results in the end. If you don't know anything about wiring electronics for yourself, then you can order them pre-made (they're normally a vaguely DIY solution).
Of course, you can do it without Ridax's little controller, a much simpler option (from the point of setting up) is a direct cable with no extra fuss.
Connect iPod directly (click me)
And your Beocentre is not old by any means! A lot of our members regularly use systems dating as old as 40-50 years. 