I used to start breeding when they were three, but now I generally wait. We have three seven-year-old maiden mares that haven't yet been bred, along with a six year old and a five year old. One of the seven year olds was trained to drive and did a bit of showing (Reserve National Futurity Driving) and she will be showing again this year so we'll wait even longer to breed her, but the other two seven year olds will be bred for the first time this year. Part of the reason for this was because I wanted to show ALL of them, but we haven't been able to show much in the last few years, for various reasons. Another reason is because we have a lot of breeding age mares and aren't breeding much lately (only expecting ONE foal this year, with over 20 breeding age mares and several stallions).