This question so accurately describes where I currently work, that I'm seriously wondering if you're talking about my company. If so, I can tell you, I am one of the younger guys who works at a company exactly as you described and we recognize that we lack experience. We have youthful vigor, time and energy, but we are hungry for experienced people who have seen the pitfalls and mistakes that can be made and give us guidance. There are always the people who put in the extra time because they are young, with no spouses or children, and the culture is sort of transitioning from a startup to a more compartmentalized corporate culture. We recognize the people who put in the extra blood sweat and tears, but we also recognize the value of an experienced worker who doesn't have to do that, and as such, there is no negative stigma from the company culture around people who want to go home at the normal time, and stick to putting in sane (40 - 50 hour weeks) time. I say go for it, because the older guys in the club get respect and recognition. If you really have wisdom and have not wasted your years, then your experience will be plenty to show for it.