Well I've no idea about internal organs etc. and metabolism, but you don't look 30 let alone 40.
As I've said about my stalker before, some women age like fine wine, some like a cheese. The former get finer the latter gte mouldier and stinkier.
Your definitely a wine (or a craft beer one perhaps, since I don't like ANY wine, the taste or smell of it knocks me sick, likewise any other fermented grape products).
And ren I wasn't saying it solely for your benefit, I was saying it because I believe it true. If I didn't, I wouldn't resort to lying in order to make someone feel good. I care about you and your wellbeing, but precisely for that reason, I will not dissemble and lie to those whom I care for. Such might be done all the time by NTs, but I find it disgusting.
All that said, I know what you mean about feeling a lot younger than chronological age. Its great isn't it? I feel the same way, although tempered by a lot of hardship and unpleasantness along the way. Innocence, none of that. But theres still that sparkle and iridescence to the world, like looking out through a bubble. Albeit one of one-way glass. I can see out alright, but it seems difficult for others who aren't on the spectrum to see in, if they can at all. No complaints about that for the most part, save sometimes having to really dumb things down to mollusc-level for some hope of being understood. But it suits me to have NTs see only those bits of me I wish them to see.