I used to be in your shoes.
However, asking these kinds of things (the "would i be a good admin yes/no") are generally off-putting to those that hire staff. The admin title has been highly glamorized for some reason, I find that those who are willing to volunteer their time but don't take their ranking too seriously make the best staff members.
A common sentiment among former staff I've seen is "don't become an admin just to become an admin", which I don't necessarily see in you -- you do seem to have an interest in helping people (but not sure if that's just to help your chances of becoming staff, I hope not anyways). Your age doesn't necessarily help, but it hasn't been a limitation in the past (not sure).
Overall: 6.5/10