When do I start trying...?

I'm having a hard time of knowing when we should start trying for a baby. Its something that we both want, but each year that passes causes more stress on me. If I were to get pregnant right now, I'd be 30 when the baby was born. However, I'm currently using the Mirena IUD, so thats not going to happen. I just feel like I'm going to be an "old mom" and I don't really want that.

My boyfriend and I have discussed waiting until we finish the remodel on our home (which we've barely started, and its a long expensive process), but I just don't want to wait another (probably) 2 years. The remodel is something that we're doing DIY style, bit by bit each paycheck, but the house is very old and almost everything needs to be replaced. We have estimated 2 years, but I just don't want to keep waiting.

I have kinda been pressuring him for us to get pregnant sooner, and he understands my concerns, but I also see his perspective of why he wants to wait.

His concerns are that the house is not up to par, and that he is unsure if he wants to stay at his current place of employment (he has a beautiful resume, education, and high skill set in his field - so he can easily get a job anywhere he applies).

I don't want to have a high risk pregnancy due to my age in a few years. Also, we already have the concerns of trouble conceiving due to him being a type 1 diabetic. So I want to start now so that we have more time if we do have trouble.

A concern that we both have is that he was recently diagnosed with a rare condition called Gastroparesis. Basically, his stomach doesn't function properly, and sometimes he gets very sick for a few days. We have gone through a lot, but we have it fairly well controlled now.

But I want to have a baby now. Am I selfish in this? I'd never force it on him or intentionally have my IUD removed without him knowing. But I just don't want to keep waiting. What do I do?