You might yearn for a well deserved vacation. You might yearn for a new job, a raise, or any of a million other things. As humans we all have unrealistic yearnings, too. My desire to wake up wealthy in the morning are not likely to come true. But, the yearning is okay to have. I just need to find out how to make it happen if it is a real yearning.
Let yourself yearn. Give yourself permission to dream. You are never too old to yearn. It keeps you striving for new goals. It keeps you alive.