Chinese proverb: If you want happiness for a lifetime, help the younger generation? Is the following indeed a Chinese proverb and if so, is the author known, is it still commonly used and how is it spelled in Chinese?

If you want happiness for a lifetime, help the younger generation.
Yes! there is a very close proverb. 养儿防老, it's not said by any known author, but just very commonly used in Chinese daily life.