5. a) older - просто как прилагательное
6. a) the latter - Пояснение:
Use latter to refer to the second of two persons or things that have been mentioned. When more than two have been mentioned, use last.
For example:
He preferred oranges to apples, because the latter were not as juicy.
He saw Leathal Weapon 1, 2, and 3 and liked the last one most.