Portfilio allocation to Bonds

[Beagle]

Watching CNBC this morning and Jim Cramers mad money and he got talking about investing for your age.
Zero bonds under 25
In your 30's 10-20%
In your 40's 20-30%
In your 50's 30-40%
In your 60's 40-50%
When retired approx. 60-70%

Bond yields are pretty low but even so this approach seems to make prudent common sense to me.
He has a book out called Get Rich Carefully - pretty smart guy - anyone know where I can get a copy ?

To be honest this weeks political and geopolitical events have sharpened my focus on risk management.
Who knows what sort of Government we have coming soon or quite how things will play out with North Korea ?

Your thoughts on the above allocation strategy, make sense ?, what do you think Peat ?