I'm mid-40s, planning on retiring in the next 1-3 years. I'm currently at an 80/20 (stocks/bonds) asset allocation and have no plans to adjust that significantly before retirement - maybe drop down to 75/25 or even 70/30, but still pretty heavy in equities.
The biggest risk to a long retirement seems to be taking a big hit to your portfolio in the first few years. If that happens to me I can easily pick up some part time work to tide me over, so it's not a great concern to me, hence the relatively high equities exposure.