Your only limitation is the one you set up in your own mind!
Strength and growth come only through continuous effort and struggle.
The most common cause of fear of old age is associated with the possibility of poverty.
Achieve self-mastery over your thoughts, and constantly direct them toward your goals and objectives. Learn to focus your attention on the goals that you want to achieve and on finding ways to achieve those goals.
Watch the one ahead of you, and you'll learn why he is ahead. Then emulate him.
Burn the boats as you enter the island and you will take the island.