In just 48 hours , the sage has figured out that it 's been pruned and has sent out reinforcements . This quick growth happens when you lop off the top piece of a branch : chemicals are released which tell latent buds below that they 're allowed to be leaves now . I know the name for this ... but my Year 12 Biology has deserted me for the time being .
Question: How old was the narrator when they learned for the biology of sage ?
The answer to the above question:


The narrator was either 17 or 18 when they learned plant biology .