Do the words in bold require capitalisation?
Mauritius has achieved marked socio-economic development according to the five stages of Rostow’s (1959) model, The Stages of Economic Growth: traditional, pre-take off, take off, maturity, and the age of mass consumption
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I would not capitalize them. They are not official terms. I see that they are called various things.
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I would not capitalize them. They are not official terms. I see that they are called various things. By the way, I would make it "take-off", not least because because that's how Rostow spelled it. Also, you have the colon in italics, and it should be in roman.