Rashi (on 27:2) quotes from the Midrash that Yitzhak was 123 and thus he was within five years of his mother's death. (Rashi's calculation is based on the Midrash that Yaakov studied at the school of Ever for 14 years after he left home, see his comments on 25:17.)
Radak (on 27:1) suggests that it was the onset of blindness that caused Yitzhak to fear that he would die shortly.
Maybe, there is another possibility. If Yaakov did not study at the school of Ever, then Yitzhak was 137 at the time of the blessing. Immediately after the blessings, Yaakov left for Paddan-aram, 27:43, and Yaakov was 77 when he came to Paddan-aram (47:9, 45:11, 41:46, 30:25: 130-9-30-14=77). We also know that Yitzhak was 60 when Yaakov was born, 25:26, which means that Yitzhak was 137 when he wanted to bless Esav. This age was significant since this was the age when Yitzhak's older half-brother Yishmael died, 25:17. Thus, when Yitzhak was 137, he feared that his death was imminent.
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