exercise: add `space-age` #39

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Run time

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Job	Run time
Find exercises	3s
Check 'anagram'	8s
Check 'armstrong-numbers'	7s
Check 'beer-song'	19s
Check 'clock'	23s
Check 'gigasecond'	31s
Check 'hello-world'	6s
Check 'leap'	35s
Check 'prime-factors'	8s
Check 'proverb'	13s
Check 'reverse-string'	15s
Check 'space-age'	7s
Success	1s
	2m 56s