EDIT: It's supposed to be 'effects' in the title, but I'm tired, and apparently cannot type to save my life.
So I'm writing a story in which a character is returning to the past to help save himself and, basically, the world. Similar to Harry in PoA, my character has to save himself, but he knows he can do it, because when he'd been younger, he'd been saved by himself.
Stop me if that doesn't make sense.
Basically I've got two problems I'd like some opinions on. First, my character is traveling almost thirty years into his past, to the time when he was seventeen, and will be unrecognizable (Different hair, eye color, a beard, and a new outlook on the world type thing, not to mention thirty years older). Does it seem plausible that the younger character wouldn't recognize himself, or would, but only subconsciously, until the older character reveals himself?
Secondly, this older character is going to be around for almost an entire year, and I wonder what sort of things you all think might happen to him as a side affect of this? Clearly it would take him 30 years to catch back up to his own time, and so he'd have to use the time turner to take him back forward at the end, else he catch up with his own time thirty years older than when he left it. But I wonder if messing with time for a year might have some long-term effects like early aging, the habits of falling ill frequently, things like that, and I wonder if you all agree, or think something different might happen?
...That's about as clear as mud, haha. Does that make any sense?