Chasidut על מגילה 33:1

We find in the Torah that the details of the life of Yaakov are not written clearly, but are alluded to, as is written in Megilla 17A: Why were the years of Yishmael counted? In order to relate the longevity of Yaakov's life - to teach us that he was blessed (by Isaac) at the age of 63, and that he was 14 years in the study halls of Shem and Ever (although this was never explicitly stated anywhere in the Torah itself). This is true especially when he arrived in Egypt and said to Pharoah: The days of my sojourn are 130 years, and since we know that he lived 147 years old, we know from this that he was in Egypt for 17 years. If this is the case his age is obvious, and there is no need for us to be told his final age of 147 years. There is therefore no need to mention both his final age or his 17 years that he lived in Egypt (we could derive one from another quite simply (ed))!