Když jsem se vydával na cestu ke hvězdám, jenom proto, abych byl naživu, až se objevíš, moje žena a děti byly mrtvé a při návratu byli moji vnuci stejně staří jako já.

Could you please translate this to English?

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
When I gave myself to starship travel, just so I would still be alive when you appeared, my wife and children all died, and my grandchildren were my own age when I came back.