I occasionally tell my wife how great it would be to be able to go back and relive some of our younger days together. Not to change anything, mind you... just as an observer - completely aware of the fact that I'm just there to observe and hopefully gain some type of different perspective, maybe better appreciate a life I once knew.
I guess it's just a part of getting older and wondering where all the time went. I'm still a hopeless romantic in that regard - still in love with my wife and she's still as beautiful as ever, but to be able to go back and relive a few of those special moments... not only with her, but with my kids.
Memories will have to suffice, I guess. LOL