Terry, (firstname.lastname@example.org), a poster at GENEALOGY-DNA-L reported age estimates for various nodes of the Y-chromosome tree based on SNPs. These can be found in this PDF file and here (scroll down for UPDATE10). He used 1000 Genomes data and SNP counting to reach these estimates.
It will be nice to see others join in on the SNP bandwagon, because that is really the way forward in age estimation for Y-chromosome lineages. SNPs have an extremely low (=negligible) rate of back-mutation, but they occur at a much lower rate than Y-STR step mutations. On the other hand, there are at most a few hundred Y-STRs and only ~100 tested by commercial companies, while scientific datasets generally include at most a few dozen of them. The Y chromosome includes millions of mutable sites and these will be generally reported both by the 1000 Genomes Project, and the plethora of full genome sequences that is about to become available.
Y-SNP based age estimation has the potential of greatly improving estimates by tightening confidence intervals substantially; there will, of course, be lingering uncertainty of parameters such as generation length, but Y chromosome mutation rates are likely to become very secure once full genome sequencing becomes so cheap that it can be applied to a number of father-son pairs.
Looking at the inferred tree, what is striking is the great distance between haplogroup A1b and the rest of the tree, or about 100,000 years. Note that these are not "relative" estimates as were published by the 1000 Genomes Project (based on "archaeologically" calibrating a node and estimating ages of other nodes by counting the relative number of SNPs), but "absolute" ones (dividing SNPs with a mutation rate).
(UPDATE: There is apparently an even more basal clade than A1b currently investigated; I have removed the link to an announcement regarding this clade, since there are issues regarding the release of this information)
Going back to the age estimates, I cannot help but notice the concordance between Terry's age estimates for DE/CF split (55ky) with the mtDNA estimates for most mtDNA L3 subclades. Terry labels DE "African" and CF "Eurasian", but, in fact DE is Afrasian and "CF" Eurasian. Together with the absence of any evidence for a post-70ka Out-of-Africa, I'd say that it is becoming increasingly clear that while modern humans can be ultimately traced to the Middle Stone Age in Africa, their major expansion that went on to colonize the entire world originated in Asia, and included a major episode of back-migration into Africa.
I also earnestly hope that the next set of Y chromosome papers on recent populations will forego the cost of testing hundreds of samples on Y-STRs and invest in full Y-chromosome sequencing of a few samples after an initial Y-SNP screening.