And it came about in the time of Solomon’s growing old that his wives themselves had inclined his heart to follow other gods; and his heart did not prove to be complete with Jehovah his God like the heart of David his father.

1Ki 11:1-8.

While this took place “in the time of Solomon’s growing old,” we need not assume that his deviation was because of senility, for Solomon was relatively young when taking the throne, and the length of his reign was 40 years. (1Ch 29:1; 2Ch 9:30) The account does not say that Solomon completely forsook the worship at the temple and the offering of sacrifices there. He apparently attempted to practice a sort of interfaith, in order to please his foreign wives.