You asked:

was kamisese mara older than ateca ganilau

Yes. Kamisese Mara is older than Ateca Ganilau. Kamisese Mara is 97 years, 4 months and 20 days old (died aged 83 years, 11 months and 12 days). Ateca Ganilau is between 65 years and 9 months and 66 years and 8 months old.
Kamisese Mara
Kamisese Mara
Kamisese Mara

Ateca Ganilau