Nice way of asking people their ages (in a survey)

[Scramblinghealingdreaming]

I need to design a survey and find a way to ask people their ages. It is very informal and I would like to make it fun too if possible. I just need to know roughly.

I remember seeing something ages ago that made me laugh - particularly about asking older people (something like - 'enjoying retirement') but better than that and cant quite remember.

age brackets will roughly be

1. under 18
2. 18 - 30
3. 40 - 50
4. 50 - 70
5. over 70

I dont actually need to include the numbers as it doesnt need to be precise.

Any ideas?

ZOMBIE THREAD

After nearly 2 years, I assume the OP has sorted out her survey.