If they are over 30, stop and think before you sign. One or two on a club is fine, but that's it. They don't hold up over the long season.
I generally agree with this but really the Flyers don't have a ton of old guys. Up front it's only Vinny (Hartnell is borderline I guess but age wise he is still in his prime). I guess age on D is an issue, you're probably flirting with disaster if you bring Kimmo back AND sign a Boyle or Markov. That's 3 really old dudes on the blue line, not sure how ideal that is. I think one or 2 veteran guys is OK, so if it's my call then if anything it's Kimmo OR Boyle, not both.
I would re-sign Kimmo and wouldn't be opposed to bringing in Boyle for the right price, but besides that, I think signing any of these guys would be a mistake. We don't need Markov, an expensive backup, or another RW.