If you are looking for an RPG system that includes immortality without house rules, there are several that have it as a base expectation of the game. Eclipse Phase is a great transhumanist system, easy to get into, with enough choices and options to run decades of campaigns. (And the designers are a cool group of people.)
I'm told though I haven't verified, that many of the White Wolf line include immortality options.
There are options for everyone. It appears that the PF design team did not feel that immortality as you seek it, was an option that the main player base was looking for in Pathfinder and so they've steered away from it. The options are still there, they just have strings attached to them to keep it balanced within their Golarion setting. In a neutral setting or 3PP world, other options may get added in to meet the PF1 availability but only if the other publishers see an economic niche that needs to be filled.