# before they lay down

"before the people in Lot's house lay down to go to sleep"

# the men of the city, the men of Sodom

"the men of the city, that is, the men of Sodom" or just "the men of the city of Sodom"

# the house

"Lot's house"

# both young and old

"from the youngest to the oldest." This means "men of all ages" and refers to the men of Sodom who were surrounding Lot's house.