A rich man was once riding along the road and saw an old man digging in his garden. On the ground lay a young tree, ready to be planted. The rich man called out to the old man, “What kind of tree are you planting there, my good man?”
“This is a fig(无花果) tree, sir. ” He said.
“A fig tree?” the rich man was very surprised, “Why, how old are you, may I ask?”
“I am ninety years old.”
“What!” cried the rich man, “You’re ninety years old. You are planting a very young tree now and it’ll take years to give fruit. You certainly don’t hope to live long enough to get any fruit from this tree. ” The old man looked around the garden. Then he said with a smile, “Tell me, sir. Did you eat figs when you were a boy? ”“Sure,” the man did not know why he asked this question.“ Then tell me this,” he said, “Who planted the fig
trees?” “Why-why? I don’t know.” “You see, sir.” went on the old man,“ Our forefathers(祖先) planted trees for us to enjoy and I am doing the same for the people after me.”
The rich man was quiet and said, “You are right，my good man. We should do some things for the people after us. Thank you very much.”  Then he rode away.
根据短文内容回答下列各问题。
What tree was the old man planting when the rich man saw him?
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How old was the old man?
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The old man was planting the tree to get himself some fruit to eat，wasn’t he?
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Did the rich man eat figs when he was a boy?
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What should we do for the people after us?