So Mephibosheth dwelt in Jerusalem: for he did eat continually at the king's table; and was lame in both his feet.
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George Leo Haydock
Feet, from five years of age, chap. iv. 4. If we add the seven years and a half of his uncle's reign, and suppose that David would take this notice of him, as soon as he had it in his power, after the taking of Jerusalem, we may conclude that he was about thirteen years old when he was presented to the king, and behaved with the most engaging modesty and respect. If he had already a son, (ver. 12,) we may allow a few years more. (Haydock)