"i belong to another discuss your sports and your young for me, i am fifty years old, and i won't impose myself on you any longer."
who did nick and gatsby see in the restaurant?

Mr. Wolfshiem

Explanation:

The was extracted from The Great Gatsby a Novel by F. Scott Fitzgerald.

Nick and Gatsby saw Mr. Wolfshiem

Mr. Wolfshiem decided to leave Nick and Gatsby alone to talk after he (Mr. Wolfshiem) finished his lunch.

Though, Gatsby told him not to be in haste (to leave), Mr. Wolfshiem declined.

What Mr. Wolfshiem meant by being "from a different generation" is that, he was much older that Nick and Gatsby (he later on stated this, when he said he was 50 years old)

Mr. Wolfshiem appreciated that he was invited to lunch and he also made it known that he didn't really care to impose on Gatsby's chat with Nick about their discussion

being surrounded by crimes, poverty, and failing schools as well as his own lack of confidence in his abilities.

you did not put the article. so i cannot answer the question.