Is it only teenagers that take on too much risk?

In a previous post, it was assumed as though only teenagers take on too much risk. What about older adults e.g. 20 year olds or 30 year olds? Aren't we only as old as we feel? We could feel like we're teenagers till we're 40 - does this mean we would tend toward risky behavior as well?
1. Drinking and driving - is this an example of risky behavior? This behavior tends to persist well beyond teen age years.
2. Unprotected sex - again, this tends to persist beyound teen age years.
Or perhaps it's not so much about risk preferences but an overestimation of our abilities -- to drive while drunk, to overcome disease.

Or would someone like Marla Ruzicka be considered to have taken on too much risk? (Note that this entry's neutrality is disputed.)