Infertility is usually defined as the inability to conceive after twelve months of sex without contraception. If you're over 35, doctors may consider you infertile if you haven't conceived after six months of sex without contraception. This is simply because women over 35 have fewer years of reproductive life remaining, so it's best if you don't wait another 6 months to seek help.
Stress and anxiety can have a big impact on your hormone levels, and this in turn can affect ovulation. For the guys, stress can contribute to problems such as impotence. Having difficulty conceiving is itself stressful, and can lead to feelings of helplessness, guilt, anger and sadness that only worsen the situation.