I have a cousin who along with his wife, are trying to conceive. They're both 35 y.o. They've been trying now for years. His wife had a check-up and everything's fie with her. Should I advise him to seek for Doctor's advise as well?

Agree with Jamie. If the wife is perfectly fine, then the husband should also go for the check up. It takes both man and woman to create a baby and logically, if one (or both) isn't functionally right, it would be hard to get pregnant. Get a gynae's help, and consider external options such as IVF (In Vitro Fertilization) and Singapore government do give subsidized treatments for married couples. http://www.heybaby.sg/havingchildren/acp.html