Second Israelite Passover; Caleb Age 40; Joshua Age 65

Q: WHAT YEAR WAS THE SECOND PASSOVER?
A: IT DEPENDS WHAT CALENDAR YOU ARE USING!
On the Gregorian calendar (the one you might have on your wall) the year was 1527 BC.
On the Hebrew calendar, sometimes called the biblical calendar, the year was 2520 AM.
RELATED VERSES
Numbers 1:1
Now the Lord spoke to Moses in the Wilderness of Sinai, in the tabernacle of meeting, on the first day of the second month, in the second year after they had come out of the land of Egypt, saying:
Numbers 9:1-5
1 Now the Lord spoke to Moses in the Wilderness of Sinai, in the first month of the second year after they had come out of the land of Egypt, saying: 2 "Let the children of Israel keep the Passover at its appointed time. 3 On the fourteenth day of this month, at twilight, you shall keep it at its appointed time. According to all its rites and ceremonies you shall keep it." 4 So Moses told the children of Israel that they should keep the Passover. 5 And they kept the Passover on the fourteenth day of the first month, at twilight, in the Wilderness of Sinai; according to all that the Lord commanded Moses, so the children of Israel did.
Caleb was age 40—Joshua 14:7 I was forty years old when Moses the servant of the LORD sent me from Kadesh Barnea to spy out the land, and I brought back word to him as it was in my heart.
Joshua was  age 65.