The amount owed on student loans has tripled in a decade, to nearly $1.1 trillion, according to the Federal Reserve Bank of New York. People in their 20s and 30s — often the best-educated and highest-earning among them — owe most of that tab. That is keeping a crucial segment of home buyers on the sidelines, deferring one of the traditional markers of adult success.

The National Assn. of Realtors recently identified student debt as a key factor in soft demand for home-buying this spring. A recent study by the trade group identified student loans as the top reason many home buyers delayed their purchase. Many more didn’t buy at all.

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