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We might add '80 years old when he attempted to help God fulfil His promise to him' when Hagar bore him Ishmael.
We usually chart events in life by our age at the time. None of us can tell how many more years we have left. In the narrative of Abram's life (next verse) he was aged 99 before God spoke to him again.
Times were very different then and life could be cut short very easily or last much longer than today.
Yours and my birthday chart should be one of steps in the Christian pathway, the ladder of faith and trust and of experiencing God's goodness. Whatever landmark it is you have reached there is more in store for you as you walk with the Lord, for when you stop counting down here eternity begins in glory!