So I went to the YO Auction... and I got: 1 Pair of Australian Black Swans, 2 yrs old 2 Pairs of Mute Swans, 2 yrs old So I now have swans, 3 pairs, and I wanted to know At what age do they breed? I have them all in there own breeding pens. Currently using stock tanks for "Ponds" Until the actual Swan Breeding Pens are done. They only way we will not move them is if they start breeding before there new pens are ready. It will take about 2 weeks for us to have them done.