I totally get where you’re coming from. I'm also in an advanced-age pregnancy and was choosing between a few doctors myself. I ended up going with Dr Jen Shek Wei, not because he was the most well-known, but because during the consult, he was calm, didn’t rush, and explained things clearly, which gave me a good gut feel. I don’t have experience with Dr Irene Chua or Dr Lim May Li, but if you’re still weighing options, maybe just see who you feel more at ease with during the first visit, it really helps.