I think Spock had cosmetic surgery.

[ed629]

Spock Pprime has detached ear lobes as where Young Spock has attached ear lobes...... and his ears got bigger, but that happens to old people anyway.

http://i7.photobucket.com/albums/y280/wilswaloe/ears.jpg

[Oversize image converted to link. - M']

 

[Borgminister]

Ear's looking at you, kid!

 

[M'Sharak]

Spock Pprime has detached ear lobes as where Young Spock has attached ear lobes......

You're only a little behind the curve; people were talking about (and quickly getting bored with) the lobe question here nearly a year ago.