Well, concidering that we know how aging works we can indeed say that dolly was 6 years old at birth, at least in some respect. Anyway what governs aging is tolomere, a sequense in the dna that becomes shorter every time the dna molecule is copied, limiting the ammount of times it can do so. Because the sheep Dolly was cloned from was 6 year sold and therefore had allready lost 6 years owrth of telomere from its dna chain dolly had a shorter life than a completely naturaally born sheep would have.
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