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Why's this? After lurking for several months I only signed up today

It's not Arvicco's stipulation it's the age limit imposed on the Ripple giveaway. It is to prevent people creating accounts just to amass Ripples.
Ah OK, that's a shame. Is there any other way to acquire them at this stage? ALSO, what happens to them as they get spent in transactions (1 XRP per transaction iirc?), do they simply vanish entirely?