As I said in my earlier post, there are pros and cons to this, from both sides of the flight deck.
In an effort to remain balanced and not turn this into a zimmer pusher vs 'sky god' debate. Yes, there are many capable older pilots. The problem is them recognising when to hang up those goggles. Let's face it, a few years ago it was a given that they should retire at 60. Most should/ would have made arrangements for that. To stay on after was absolutely their prerogative but also a little lining of the nest. It certainly slowed up any advancement for those below them. Funnily something that never happened for these more senior pilots?
The flipside are the young sky gods. I have flown with many. They range from the inquiring mind, capable and recognising his/hers limitiations to those that think they are invincible. For the most, they are easily identified and dealt with.
I would not want to lose the body of senior experience, but I daresay the companies might. Fortunately, I am 'only' 39 so this is a long way off but it's going to be a mindfield to sort. Those of us with a string of ex wives and kids are always going to need a few extra years to offer a comfortable dotage.