单项选择题

W: When did you become interested in collecting stamps
M: Oh, when I was about ten years old.
W: Ten years old So you have loved it for 9 years.
M: Yeah, it’s really an exciting hobby. You know, the first postage stamps were issued in Britain in 1840.
W: Really I didn’t know that. What’s on the first postage stamps
M: Well, look, here’s a picture of the first two stamps issued.
W: Oh, they both bear a picture of Queen Victoria, don’t they
M: Yes, I wish I had the originals, then I would be a wealthy man instead of a poor stamp collector.
W: But I believe collecting stamps gives you much pleasure which not all wealthy men can enjoy.
M: Yes, I do agree.

How old was the man when he became interested in collecting stamps（）

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