I am 28 and I am actually in a similar situation, but honesly in the last months, my mind started to chillout about getting old with the risk of stay behind. It doesn't really matter the age of a developer, but the most important thing is the curiosity about what he does. A developer without curiosity is a walking-dead-dev, you can be passionate (I don't like the word itself because means suffer in latin) and love your job, but the curiosity is what makes a developer shine. So, unless you lose this, you don't really have to worry, try to learn always as much as you can and keep going on, you will definitely find your path and the way to enjoy what you do.