Do I need to worry about my sodium intake if I'm only in my twenties?

Good habits start. early. Your body can currently compensate for a high sodium diet but its not something you want to keep up. Everything should be in moderation. But, the fact that you took the time to ask this question means that you are thinking about what you eat which will serve you well. Good luck.
Not particularly . As your body does a great job balancing electrolytes, particularly sodium levels, by modulating water balance. Unless your have an extremely restricted sodium intake or very excessive water intake you should be fine. .