A couple things. Richard never said he didn't age/is immortal because Jacob touched him. He went on to say Jacob gave him a gift/deal. I think Richard's immortality/inability to age is more of a personal deal with Jacob than a "Jacob merely touched me" thing.
Also, IF Widemore is on Team MiB, maybe MiB merely wanted Ben to come with him to serve up as a offering of sorts to Widemore (seeing as how Widemore hates Ben, and maybe the sub is MiB's ticket off the island?)
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