I'm a 34 year old male and my wife and I have been trying to pregnant for 1.5 years. Its depressing. Do men lose their fertility as they age?

Nothing lasts 4ever. Like women, fertility does decrease with age. The rate at which infertility develops in men however is very different then women. It tends to develop more slowly and for some men, apparently not at all. A perhaps overly simplistic rule of thumb is a 20 year difference; 40s for women, 60s for men.