yes. current medical science is having issues treating simple thing with humans (paralysis or any thing related to it ). solving aging, may be in next 500 years.
It could be just another track of medicine we haven't really begun to formalize correctly
You're discounting the law of accelerated returns. It might take another 50 years to make a "big discovery/milestone in curing aging" but from that point forward it might become a lot easier to cure aging.