Here is a link to USAT&F where a master runner set a world record in the 1500 recently.( in his age group 45-49) http://www.usatf.org/news/view.aspx?DUID=USATF_2005_03_07_14_12_23
As to answering your question the time could range from 3.40 - 3.50 . ( it all depends on how good he wants to be )
I had a site where times are ranked for submasters and masters, as well as records for each age group; once i find it i will post it for you.
since he was a sprinter why doesnt he want to just sprint again with a focus on the 400?
I never heard of a sprinter or xsprinter in his case wanting to run the 1500! Unless his sprinter mentality has totally changed :eek:
I have, the reasons are injuries, particularly hamstring related ones, and time.
With all the other commitments many find it easier to simply run for an hour 4-5 days pw and use that as their training. Most Masters athletes compete for the fun of it & ages 35 -50 are very busy years with work and family…trust me on that