There are several things that could've caused the sudden disappearance. He could've gotten incredibly busy at work, or his family life may have gotten suddenly complicated, or perhaps he just lost interest and didn't feel like telling you.
But since you brought up his age, let's explore some age-specific reasons. Ten years is big gap. A 28 year old has very different priorities than an 18 year old, and a 38 year old has very different priorities than a 28 year old. He might be ready for children now and he realized that someone ten years younger might not be. He might want someone who could contribute more evenly from a financial perspective (not that I'm saying he's rich or you're poor, but people do tend to make more as they age). Maybe it was the fact that the pop culture references that shaped his youth are a decade older than yours.
Having "a nice time" on half a dozen dates was just not enough to outweigh the logistical and social challenges of dating across so wide a gap. Now you know.
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