@Arch_Seraph Yeah! It's whatever you feel comfortable with! I did see your story; I just added it to my reading list. (I apologize in advance; I'm very behind on reading, but who knows, maybe I'll actually have time to read this weekend.)
I feel and have felt similar nervousness about g/t content because I love it so much and constantly think about it. Clearly, if you look through me, it works. XD. And it's hard to share that with the world because it's near and dear to me. But I'm glad I did because it's helped me make connections with other people who enjoy it as well.
Yeah, I love the story idea. And honestly, with the age gap, you could take it in many directions, like exploring the concept of being older cause she lived multiple lives. Or does her memories and experiences age her up, or does she struggle with that? How does that effect her and her interactions with her current reality? You could do whatever you want; it's just fiction, and the characters are our dolls to play out the story. Theres no wrong or right in the creation of a story.
It sounds like a fun story, and you already have a good start. I definitely think you should give it a go when you feel comfortable doing so. Because if I write a story about this idea, it's going to have my own spin on it, so it probably won't be exactly the story you are thinking of or want.
I totally get the feeling of lacking the skill to write an idea, I have a few in my story journal, I'm holding off on starting because I don't know how to describe the concept, but as I write more and finish my current stories, my confidence goes up, so I'll likely take a stab at some of them, and just see what happens at some point. It will probably just take some more time compared to other story ideas. But I bet you could do it. The only way to get the skill is to do it.
By the way, I think it's awesome that you do both writing and art! Remember to give yourself breaks, and have fun!