Sayyiduna Abdullah bin Abbas (may Allah be pleased with them both) says concerning the saying of Allah Almighty: "Did We not give you a lifespan long enough for whoever would take heed to take heed in it? And the warner had come to you" [Surah Fatir: 37]: It is sixty years.
This is mawquf (a Companion's own statement). Ibrahim bin al-Fadl al-Madani narrated it, and he is not strong.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الجنائز / 6520