Well, I old man will feel happy if he has achamplished everything he ever wanted in life. Hope this helps :p
Answer:
has
Explanation:
Has is used alongside the PRONOUNS <em>H</em><em>E</em> / <em>S</em><em>H</em><em>E</em> / <em>I</em><em>T</em> and <em>W</em><em>H</em><em>O</em> and SINGULAR NOUNS.