I'm an adult, as in not a young person, some might say old, but being an adult does not describe my piano playing ability, or lack thereof. However, there are some aspects of being an adult, or even an older adult, that might come into play, like physical aspects of having fingers that aren't as nimble as a young persons, or finding a comfortable seat, chair, bench, or hearing loss, or wondering if other adults have resorted to using a 24 inch monitor to blow up sheet music.
I began playing piano as a kid, but chose the saxophone over it. (Which I regret to this day.) I started playing electric bass in rock bands in my teens, and in one band, some of the songs we wanted to play had keyboard parts, and I was nominated to cover those parts, while one of the other guitarists played bass. I learned it all by ear and hacked my way through it. Later, I switched to guitar and focused on blues, and later slide, fronted my own bands, and played with others. Eventually, I outgrew the loud band thing and revisited the tenor sax, playing jazz, mostly standards, some be-bop, and was quite happy as long as I had the right rhythm section. For without the right rhythm section, it is no fun at all. And without a rhythm section, the saxophone is a lonely instrument to play. And when jazz gigs dried up, and players retired, I looked to the piano - a complete solo instrument capable of endless avenues of expression and fulfillment.
I thought about finding a proper piano teacher, but decided on the Alfred Adult books, which I became bored with. So, I spent hours reading, Mark Levine's Piano Book, and listening to Bill Evans, and tried to put together songs that I like.
Where, or how, would a piano dabbler/explorer like me be classified, or find other interested piano people to connect with? I don't consider myself a beginner. I do think most of the members of this forum are probably adults. Whatever Navindra decides is fine with me, and I thank him again for creating this forum.