I've just been reading a newspaper report of the business at Kapalua. It seems that in the play-off Vijay Singh hit a drive of 394 yards. Apparently he then messed up the second shot. I've not seen it, and, in a way, it doesn't matter. Singh is in his forties.
I also saw dozens of chaps, mostly in their teens, a few as old as 21, dominating proceedings at the US Amateur this year at Merion. I cannot estimate the length of their drives, but a lob wedge in to a 500-yard par 4 suggests that they expect to hit the ball well in excess of 300 yards.
I am now 57 and getting very geriatric, yet I managed to hit the longest drive of my life last year, off the back 12th tee at Royal Troon. It was around 350 yards. My normal drive is down to around 200 yards - that's where (at absolute best) it lands and if there is any roll it is a huge advantage. I imagine that if I were taken back to that tee at Troon with 100 balls, the wind in my favour, the fairway bone dry and decent contact with the ball I might manage 5 drives at 250 yards.
How come these elders - nearly my age, come on - can hit drives of almost 400 yards in the heat of battle? By the way, despite my prodigious drive on that hole, I was still very happy to walk in from the 16th green having been utterly humiliated.