I was 100% equities until about a month ago. Now that I'm 10-13 years from ER,
and after reading Bernstein's "Intelligent Asset Allocator", I decided to switch to
20% bonds.
My reasons for being 100% equities were:
1) In theory, best chance of high returns over long time periods.
2) I seem to handle portfolio volatility just fine (2000-2002).
3) ER seemed far off, and having to postpone for a few years due to portfolio volality
wouldn't be a disaster.
Reasons for 80/20 AA:
1) As I get closer to ER, volatility has a bigger chance of affecting my ER date
substantially. 80/20 is still a high equity mix, but past 80/20 returns have had
significantly lower volatility while not giving up that much in returns.
2) Bonds are a less-correlated-with-stocks asset class, and being able to slice and dice
among uncorrelated asset classes is good. (oversimplification alert!
)
It was interesting watching my reaction to the market blip on 2/27/07, right after
I'd gone to 20% bonds: the bonds probably made the drop slightly less painful, but
I'd gotten in the habit anyway of not letting how I feel about portfolio losses affect
my actions.