I'm Already Eighty, So Why Is the System Still Making Me Have Heirs?

Zhang Lingyuan is an eighty-year-old man when a soft yet heavy female thug suddenly pins him down. Is this a honey trap, or… a gift from nature? So much for a dignified old age! He thinks his time has come, but this calamity awakens the more children, more blessings System that’s been dormant for decades! Rewards unlocked! Why didn’t his eight wonderful sons activate the System? Is this the tired old plot where someone comes to break off an engagement? The prospective mother-in-law who shows up to cancel it turns out to be a rare, highly compatible match? Help me up! I’m going to restore the family’s glory! While others cultivate immortality as teenagers, I’ll conquer the heavens at eighty!