Definitely being in your 20's is so much different. When I was 19 I spent 7 months in south America and I could sleep in buses, eating whatever food and I was ok with that. But I just can't do tha tanymore. I'm getting too old for certain things. The worst was getting so sick, and still being sick from the food or the water I drunk. With age your body just doesn't recover as fast as before and that creates another barrier.