Why didn't the Potters disapparate?

[Vicki Granger]

No: HPFGUIDX 23176

Catriona Wrote:
...what is to stop younger witches and wizards getting their elder 
siblings to teach them how to apparate in order to do it illegally?

~I think there are two things stopping this (or possibly only one, a 
combiation of the two) apart from leaving a trail etc.

1* It is hard, advanced magic that probably isn't able to be done by 
most under-aged wizards and witches even if they could do it legally.
2* Splinching, which seems happen when the spell isn't done properly 
(which ties in with the under-aged not being powerful enough).

In Book 4 Arthur Weasley says:
"It's not easy, Apparation, and when it's not done properly it can 
lead to nasty complications. The pair I'm talking about went and 
splinched themselves." 

~*Vicki*~