Hannibal's original soldiers: What happened to them?

[VikingPower]

Hello.

I was recently doing an essay about the battle of Zama. There Hannibal employed three lines of infantry.
1. Mercenaries: Celts, Moors, Baelerics, Ligurians.
2. Carthaginian citizen militia (hoplites? Pikemen?)
3. Veterans from Italy: Bruttians.

But what actually happened to the original troops, that Hannibal took over the Alps? Iberians, Africans (Carthaginians? Lybians? instead of Numdians or Moors)...
He did at least triumph in three great battles in Italy, that of the Trebia, Lake Trasimene, and Cannae.
Decisive victories with minimum casualty of his best troops and maximum casualty on the Roman side.

I know that Hannibal was about 15 years in Italy, so that some part of his troops would perhaps be considered too old. Or killed in small numbers here and there.
But that did not stop the Silver shield pikemen, the old veterans that fought for Eumenes at the battle of Gabiene.

I am just wondering what happened to the Iberian and African soldiers? how did they gradually loose their numbers? where and when?