Saying death makes life meaningful is a cope. If we could get rid of aging, almost everyone would do it. Us being programmed to die is just bad. It doesn't make life meaningful, as everything is temporary even if you ignore death. Gratitude is what makes life meaningful, not inevitable death.
I'd live for billions of years if humans were capable of it. I want to live in a world filled with immortal people in peak physical condition. People would regrow limbs, heal brain damage, and be able to fully recover from any non lethal injury. I'm not convinced any of that will never be possible. Someday, death from old age won't be an inevitability, but a choice people are free to make.