I don’t mind fandom elders but being a fresh 18 I don’t know when it’s alright to befriend fans so much older than me and who have more life experience. Should I wait a while longer? Maybe when I feel more confident as an adult?
I think that’s always going to depend on the adult you’re talking with and your own comfort levels. I mean, you’re talking with someone who’s almost forty right now. XD
In most cases, if you’re just talking about fandom things--it’s not going to matter how old the person is. Gushing about your favorite characters, fanfics, art, or story plots isn’t going to change much no matter what your age. I have fun fandom conversations with people ten years older than me and ten years younger.
The age gap shows up once in a while (like when personal topics come up, like spouses and kids and whatever), but it’s no different than when I’m talking with people older or younger than me in real life.
When it comes to discussing more mature topics in shipping, that’ll be a personal call. Most reasonable adults are more than happy to set boundaries about what topics are okay to discuss and what aren’t, and then respect them--no matter what your age. Just because someone is older (or you’re both the same age) doesn't mean that they are okay with mature topics.
Last of all, trust your gut. If a conversation is making you uncomfortable, there’s probably a reason.
On a side note, I do think that a lot of modern fandom culture has warped some people’s senses of interacting with those older or younger than you. It’s very common in the real world to be around people much older and younger than you in many situations. Your coworkers, your friends, your friends’ friends, your friend’s parents, activities you join, classes--there’s a wide range of people with different life experiences.
Example: I’m in a local, hobby orchestra and most of the people in it are twice or three times my age--making me the young one around others with more life experience. But for one concert, we had some high school students getting extra credit for some class or another, so I shared a music stand with a bright and fun teen. We talked music and safe subjects, with a bit of “In my day we didn’t have snapchat” thrown in for fun (and I in turn get the “In my day we didn’t have mobile phone” conversations from the older members lol).
The end point: It’s your call. If you found a super cool older person in fandom to chat with and interact who doesn’t pressure you, that’s great! Have some fun!
Just remember that regular internet safety rules apply to all: Don’t give out too much identifying personal information, if you do choose to meet make sure it’s in a public place and people know where you are and who you’re with, keep topics in your comfort zone, feel free to drop out of conversations that make you uncomfortable.
And if you find you’re still unsure talking with older folks, that’s fine, too! Be polite and find some friends closer in age. A well adjusted adult will understand and respect it (and likely remember being that age too!).