"This is my 20th year in the sport. I've known swimming and that's it. I don't want to swim past age 30 if I continue after this Olympics, and come back in 2016, I'll be 31. I'm looking forward to being able to see the other side of the fence."
"Age is an issue of mind over matter. If you don't mind, it doesn't matter."Michael Phelps on Mark Twain
"Anyone who stops learning is old, whether at twenty or eighty. Anyone who keeps learning stays young. The greatest thing in life is to keep your mind young."Michael Phelps on Henry Ford
"Wrinkles should merely indicate where smiles have been."Michael Phelps on Mark Twain
"True terror is to wake up one morning and discover that your high school class is running the country."Michael Phelps on Kurt Vonnegut
"A diplomat is a man who always remembers a woman's birthday but never remembers her age."Michael Phelps on Robert Frost
"I have reached a place in my life where I need to sit down and say, 'Well, what do I do? What's best for me?' I need to look into options for the future."
"If you want to be the best, you have to do things that other people aren't willing to do."
"I want to test my maximum and see how much I can do. And I want to change the world of swimming."
"I want to be able to look back and say, 'I've done everything I can, and I was successful.' I don't want to look back and say I should have done this or that. I'd like to change things for the younger generation of swimmers coming along."
"It's cool just because I've had this dream of changing the sport of swimming and it's finally happening."