Are you old?

Anyone who stops learning is old, whether this happens at 20 or 80 plus.

Anyone who keeps on learning not only remains young at heart, but also becomes constantly more valuable regardless of physical changes.

When you get discouraged with your efforts to keep going, remember these words of Thomas Edison.  He was describing the number of experiments that he had conducted before he succeeded in developing a successful light bulb.

"I have not failed.  I've just discovered 10 thousand ways that won’t work.”