People who love you today. People who are with you today. And the people who lift your coffin after death are completely different. Always invest into the new generation and kids. Even if they are not yours. How you treat others teaches you how you will be treated till you reach death. Always invest into younger generation. Even if you have kids or not. Invest in your future. Kids, trees, animals, clean environment. Your investment in this decides how your old age will be smooth.