I'll turn 60 in August about the same time to celebrate my first anniversary of playing DG.
So, I don't know much about loss of distance versus age since I haven't been playing that long. I chuck 'em out there about 300-320' on average and have found that the better my techique is, the less effort I have to exert.
What I have found out is that most of the injuries I suffered at other sports (raquetball, tennis, etc.) earlier in my life have come back to haunt me the older I get. Arthriitis and tendonitis are with me every minute of every day. Plus, muscle soreness takes a lot longer to get over the older I get. But, then again, that's why God invented Ben Gay. LOL
Will I let it effect me? Not even a little bit. I love this game and will continue to play as long as I'm looking at the grass from up here on top.
A good friend of mine who just turned 65 and has been a pro golfer most of his life has a saying: "As you get older, you have to find a different way to do the same things you did when you were younger."
If you're really worried about losing distance, hang out with fat people with really short arms. LOL
Woodpecker