“mind over matter”
“Age is mind over matter. If you don't mind it doesn't matter.”
“Age is an issue of mind over matter. If you don’t mind, it doesn’t matter.”
“It’s called mind over matter. If we don’t mind, it doesn’t matter.”
“Age is merely mind over matter. If you don't mind, it doesn't matter. Mark Twain”
“Getting fit is all about mind over matter. I don't mind, so it doesn't matter.”