There are currently no applications to fill out. The staff are hand picking people that show maturity and other helper like qualities.
As said above, staff applications are closed. However, by being active in the community (both forum and server) and helpful, you could have a chance of being hand-picked for staff
There is no age limit for staff. They believe in maturity more than age And as a staff member, you have access to /kick, /mute and a few others. Your job is pretty much to moderate and help the players of this server. But it is a very hard process to get into the team, but it pays off well reputation wise later on. Also, please don't bump month old threads unless you're the OP (Original Poster) bumping it with a relevant reason
Just keep on helping, you'll get noticed and hence you might be given a chance for Helper. Show consistent professionalism, maturity and be acceptive towards others. Exhibit excellence and you might be given a shot, but don't shoot the gun to early and give up after a long time of showing positivity and just break down and whine about it. (Not implying that you are, just giving an example of a possibility). Good luck.