Because it is a grand human tradition to show extra kindness, attention and indulgence to the young, that they might be equipped to build a better world.

Someone helping me with a project is nice. Someone helping you with a project is an investment in the future. My neuroplasticity wanes with every passing year. Your mind remains limber. I am encumbered by obligations and debts, limiting my flexibility. You have infinitely more options.

Helping you is just a better bet than helping me. You're still on the launchpad, fuel tank still full. If there's something simple, like an encouraging comment or a thoughtful correction, that can be done to help you meet a wonderful trajectory, we should absolutely do it.