You are correct. Waiting until ones late 30s early 40s is a good choice. Get financially sound, then if one finds a partner good. If not that's ok too. I've seen so many marriages of young people in their mid 20s not even last a year.He's still young then.
He might very well decide to look for a relationship later.
I wasn't in a serious relationship until my late 30s and i had no plans of getting married but I met a great girl.