1 embryo or 2?

My husband and I have been discussing whether we will transfer 1 or 2 embroyos. My doctor recommends just 1 but will do 2 if we want. He said because of my age (29) and that's fairly young when the average women doing <a href="https://glowing.com/glow-fertility-program">ivf</a> is 35 and up. But I'm not sure yet? What is everyone else doing?