And the people served the LORD all the days of Joshua, and all the days of the elders that outlived Joshua, who had seen all the great works of the LORD, that he did for Israel.

And the people served Jehovah all the days of Joshua, and all the days of the elders that outlived Joshua, who had seen all the great work of Jehovah that he had wrought for Israel.

And they served the Lord all his days, and the days of the ancients, that lived a long time after him, and who knew all the works of the Lord, which he had done for Israel.

And the people served the LORD all the days of Joshua, and all the days of the elders who outlived Joshua, who had seen all the great work which the LORD had done for Israel.

and the people serve Jehovah all the days of Joshua, and all the days of the elders who prolonged days after Joshua, who saw all the great work of Jehovah which He did to Israel.

And the people were true to the Lord all the days of Joshua, and all the days of the responsible men who were still living after the death of Joshua, and had seen all the great work of the Lord which he had done for Israel.

And they served the Lord, during all his days, and during all the days of the elders, who lived for a long time after him, and who knew all the works of the Lord, which he had done for Israel.

If Joshua was about 80 at the entrance into Canaan, 30 years would bring us to the close of his life. The "elders" would be all that were old enough to take part in the wars of Canaan Judges 3:1-2; and therefore, reckoning from the age of 20 to 70, a period of about 50 years may be assigned from the entrance into Canaan to the death of the elders, or 20 years after the death of Joshua.
The great works of the Lord - The overthrow of the Canaanite nations.

And the people served the LORD all the days of Joshua, and all the days of the elders that outlived Joshua, who had seen all the great (c) works of the LORD, that he did for Israel.
(c) Meaning, the wonders and miracles.

And the people served the Lord all the days of Joshua, and all the days of the elders that outlived Joshua, who had seen all the great works of the Lord that he did for Israel. In Egypt, at the Red sea, in the wilderness, at the river Jordan, and in the land of Canaan; See Gill on Joshua 24:31. The Jews (a) say, the elders died on the fifth of Shebet, which answers to part of January and part of February, on which account a fast was kept on that day.
(a) Schulchan Aruch, par. 1. c. 580. sect. 2.