Getting -fit- is key, especially with the driver, but to answer your question, it is still best to have the most flexible shaft you can control, especially when distance is important.  That being said, if you are still swinging around 80-85 mph, then stick with a Regular shaft, or one of the newer 'soft regular' that will bridge the gap there. 

I am 63 and my swing speed is 83 with the driver.  3 handicap with a 220 yard drive.  Obviously fairly consistent.

I was fit with the red Bassara driver shaft in R.  I think there is a new version of this, the Diamana red (the same).

Perfect shaft.  The Blue shaft is too stiff, the white shaft feels even worse, and the senior flex is way too whippy.

The senior shaft is for 70 mph driver speeds, said the Titleist fitter.  Red for 80s, blue for 90's, and white for >100.  Easy.

Luckily, Titleist has options, but not too many.  Too many and your not confident in your choices.  Too few and the clubs usually feel like bricks (like the cally uniflex or the Dynamic Gold).

I would say, however, that the wedges have too many options.  Too much confusion over what to get.  Should you go 50,54,58 or 52, 56, 60?    Or 52, 58 or 50, 54, 60?  What bounces and what grinds?  Is there any logical way to figure this out?  Each pro has a different story, but none are based on any evidence other than guesswork.  The Vokey web site is not helpful here either, other than describing the infinite choices of bounce, loft, and grind (and to go to a fitter).