If you can afford it, I would say hire a reputable trainer to come and help you. Above posters are right; if you continue on your own you could accidentally scare these mares or get yourself hurt. You are smart, or you wouldn't think you needed help. Just because you and not experienced doesn't mean you can't get a professional to help you and end up with two lovely, rideable, quiet mares fort you and your boyfriend to potter around on or even do shows with - the hurdle is getting them there. If you can't afford a trainer, I would suggest - and I know you'll feel like you heart is broken and you have failed the mares - but give them away, to a knowledgable home who can give them what they need. You may love them, and they may love, or be learning to love, you too, but the kindest thing would be to move them on. Otherwise you would be throwing money after horses you can't do anything with. And while you wait for a trainer to come, as southwardkiwi said, get close to them slowly. If you can catch one, groom her, feed her treats, talk to her, and maybe the other one will slowly work her way up to meet you too. To me, age is not much of an issue as when I was 11 I was gifted a 10 year old unbroken mare who ended up being a lovely horse - though she is probably one in a million. Don't assume because she was a "PMU mare" she is awful - that's like assuming all ex-racehorses are bonkers (they're not), or all quarter horses are quiet (tell me that when I've hit the dirt again). These may be two sweet, gentle mares hiding under a nervous or scared mask. Who knows how kindly they have been treated in the past.