"огурчик" and expressing agreement
I am currently preparing for the TRKI-3 test and have been going through a couple of mock exams recently. One of the tasks in the oral exam is to participate in a conversation with "friends" and to express the same opinion as them, only in different words. This is one of the cues:
- А вот прадедушка мне понравился! Такой здоровяк в свои 88!
- Точно! Как огурчик.
1) What exactly is the meaning of 'огурчик' here?
2) What other words are there to describe an old person that bears his/her age well?
3) What other ways of agreeing (in a very colloquial context) are there except for точно/совершенно верно? There are four of these cues altogether and I feel like an idiot repeating the same phrases over and over.
Спасибо заранее for your help!