I'm wearing a pair that I bought in May 07. I've never washed them. They don't smell because I rotate them with other pairs.
Febreze if you must, but eventually the smell will worsen. Washing your jeans in detergent ruins them as the enzymes are harmful to the fabric. It is also damaging for the environment by using lots of water unnecessarily. Air them on the line during the day and any odour will miraculously disappear.
Jeans should only be washed when they feel damp to the touch. Hand wash using only vegetable-based soaps with very little agitation to reduce indigo loss. Line dry. Good for another year or so.
NEVER use an iron! Ironing jeans is just wrong, from every perspective.