Well, my lifetime has been considerably shorter so far, so this is easy:
Reagan
Bush 43
Bush 41
...
...
...
...
...
...
Clinton (who doesn't deserve to be ranked anywhere near Reagan)
Are we ranking presidents during our lifetimes?
Here we go, best to worst:
Reagan
*gap*
Bush 43
Bush 41
Ford
*big gap*
Nixon
Clinton
*gap*
Carter [spit]
Johnson [spit]