The hard line that most women face with fertility is age 45. Some women can even conceive past that, so it's not that crazy to think about. Fertility issues are just as likely to be due the man's sperm, not the woman's ability to conceive.
Also, they've been trying for a few years. From context, it seems like they started trying when she was 30 or 31 and gave up when she was 40.
He’s gonna be a stage dad, not his fault since he comes from a line of dancers but this guy probably is the kind to put all his expectations on his kid. I feel bad for the wife.