10 years without baby!

I have a friend who is 10 years married to her husband and she is now 28 years old. They tried and still trying so hard to have one but it is not the right time for them, I guess. They have the regular consultation/checkup but no problem found on both sides. My friend does the healthy lifestyle, as well. Is there still a chance for them to have a baby? Is there anyone here who can relate?