In present and future time references, do we have to use the future aspect before "till"
The hair and nails will continue to grow till you die.
I ask, because, to my mind, the act of growing is a fact; so it makes more sense to me to say:
The hair and nails continue to grow till you die
However, I have some doubts about my using sentence II without the modal "will". Is sentence I more grammatically acceptable than sentence II?