are older people and younger people e.g. aged 70-80 be more prone to diseases and illness?

Question: are older people and younger people e.g. aged 70-80 be more prone to diseases and illness?
- Keywords:
  age,
  disease,
  expose,
  illness,
  old,
  people,
  prone,
  young
Asked by maria96 to Probash on 18 Mar 2011 in Categories: Your Research.
- Probash Chowdhury answered on 18 Mar 2011:
  
  Some diseases yes. Mainly those that are defended by our immune system. In very young people the immune system has not fully developed and is still “learning” how to fight. In the older generation, their immune system is slowing down and the immunity cells are not being replaced as fast as younger adults. therefore, these two ends of the population’s age range are more affected by some diseases.

Question: are older people and younger people e.g. aged 70-80 be more prone to diseases and illness?