I have two 15-yr-olds, a DD and a DS (twins). They are both autistic, with a variety of other diagnoses thrown in.
Both have relatively high needs, DS more so than DD. Neither can leave the house on their own, cross a road, pay for something in a shop. Both need me to be in the bathroom to shower/bathe, and both still struggle with shampooing their hair to varying degrees. DS is still in pull-ups and has no continence at all. They can't make any meals or food, although we've managed to get to the point of being able to do cereal (more or less).
I've tried everything possible to encourage independence but neither are anywhere near it yet. DS definitely won't ever live independently, and it's doubtful whether DD will.
Weirdly though, I actually think I hit the jackpot with my two beauts. I don't have to worry about where they are or who they are speaking to. As it stands, they still tell me everything. At home and in private they are funny, charismatic, young adults - although others wouldn't see this side of them. I don't have to worry about DD falling pregnant or either of them touching drink/drugs. They love to hang out with me.
DS is almost as tall as me, but he still wants to be cuddled like a big toddler, and likes to play "boop" with my nose and "piggies" with his toes. Loves his teddies. If he could sit on my lap he would.
Life can be a bit relentless sometimes and there isn't an end in sight, but we're in this strange limbo where I get the very best of them being more mature while still enjoying the cuddles and company of their younger years.
So I am so unbelievably lucky, I think.