
Tacticslion |

They do not.
There are technical "guidelines" available in the Core book that you can use (rules from Paizo's own PDF), and you may always update the old 3rd Edition Epic Level Handbook, but Paizo has been explicit that they wanted to do "epic" levels an entirely different way - and so they introduced Mythic rules instead.
Mythic is entirely different from Epic, save that both are very powerful. Mythic effectively gives you a second "track" to follow either at the same time or after your level-ups that doesn't affect your BAB or HD or anything like that, but generates special "mythical" abilities associated with skills, feats, and class features and such that you already have.
Hope that helps!
EDIT: You can also check out the mythic rules from Paizo's own site, but I find that presentation lacking, as it doesn't have any clean introduction, unlike the d20pfsrd.com that I linked. Similarly, you can find really cool Golarion-specific mythic stuff at Archives of Nethys, but none of the generic stuff.
I will always and forever heart the old 3E ELH, myself (though I'd have preferred a "proper" update to 3.5), but Mythic is a pretty awesome system... even if it's still unbalanced and can introduce it's own weird and unexpected problems (much like the epic levels systems of old!).
Also, I added the link to d20pfsrd's record of levels above 20th and the PRD.