Yéye qīshí suì le hái zài xué diànnǎo, zhēnshì lǎojì-fúlì.
Grandpa is seventy and still learning to use a computer: old in years, young in ambition.
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From 曹操's poem 《龟虽寿》: 老骥伏枥,志在千里 "an old steed in its stall still dreams of a thousand li". He wrote it in his fifties, on campaign, and the next lines say a hero's heart stays bold in old age. 骥 is a fine horse and 枥 a stable trough.