I heard some ass hole refer to the S600 as "an old man's car"... Oh brother 

The big body S and the Lexus LS tend to be old man's cars, because they are geared to them, and typically they can afford them...the range goes like this S550, S600, S63 AMG, S65 AMG...S550 and S63 with V8s. S600 and S65 with the V12s. V12s are usually smoother and denote luxury. All have air suspension...air suspension means "softer", older people like softer rides (think 80s-90s Lincoln Town Car).
A guy I know who's in his 50s has the S63...that V8 is THE SHIT...