Reminds me of this I heard/read somewhere:
When you're young, you have the energy and time, but no money.
When you're middle-aged, you have the energy and money, but no time.
When you're old, you have the time and money, but no energy.
When you're young, you have the energy and time, but no money.
When you're middle-aged, you have the energy and money, but no time.
When you're old, you have the time and money, but no energy.