Check the Melbourne instagram scene. Probably more people under 18 doing things than people over it. I tend to find a lot of the minors in the scene have issues. Urbex is their escape. A lot of them skip school a lot, steal things, come from broken homes. Urbex gives them a place to be somebody, to feel like they're a part of something. Urbex is also a social network of sorts. Sure I've found a few spots but most things I do are found via contacts I've made in the scene. Some people like to view urbex as some sort of competition, and don't get me wrong if some random asks me for spots I'd probably give them the most well known drains and be done with it. But once you build up friendships and trust is established an absolute plethora of knowledge is opened. A solo explorer is great but the social side of urbex is quite enjoyable and rewarding once you find the right people. Most of my friends are urbex based, I connected with them through sites like this, instagram, friends of friends etc. It takes time to build those contacts, you have to take newbies into drains and invite people you don't know from a pile of straw along on an expo and hope they're ok. I've explored with a lot of people, most don't hang around but a few do. One mind is great but get 10 people together and I can guarantee you that each one of them has a unique spot that no one else in the group has done. Starting in the scene can be hard, I started with drains. They're not so hard, plenty of maps floating around online and people aren't so reserved about giving out drain locations. I'd recommend them as a starting point. Then as you get to know more people you'll get to see more things. Started with drains, then came abandos, then bridge rooms, then cranes, then rooftops. It's a chain that you have to climb.
Wander often. Wonder always.