Did I draft too many old guys?

[waswik]

I am afraid I drafted too many old guys prone to injury. I am in a 12 team league, standard scoring with 0.5 PPR.

Here it is:
QB - B Roethlisberger
WR - T Owens
WR - Hines Ward
WR - Lav Coles
RB - B Jacobs
RB - B Westbrook
TE - J Witten
K - Akers
DEF - NE

BN - M Cassell
BN - J Delhomme
BN - Chris Henry
BN - J Morgan
BN - Reggie Bush
BN - LeRon McClain

I thought I bought pretty low during the draft on the old guys, but now I am worried. My entire WR lineup is worrisome. Westbrook is a stud but is getting banged up and showing signs of age. If one or two of these guys go out, then I am very thin for options. What do you think? Where am I the weakest?