Do any NIH post-doc grants besides the K99/R00 have time limits from graduation? I didn't immediately find the 4-year death-clock on the K99/R00 grant. I just want to know, is that the only major NIH activity code that restricts eligibility based on time since graduation?

I realize that individual institutes vary a lot in their policies, but I'm trying to get at least a rough idea of which activity codes to filter out before I go through in more detail through the RFAs that remain.
The rules seems to be institute and FOA dependent. There are definitely other FOAs that have timelimits. The one I am most familiar with is the NIDCD Early Career Research (ECR) Award (R21) which has a 7 year time limit from graduation. The NIDCD K22 only allows 2 years of research experience (which is not quite a graduation based time limit).

The NIH also gives preference to Early Stage Investigators for some grants which has a 10 year time limit. That page lists a number of early stage grants which may have time limits. You could also look at the NIH Research and Career Development pages for individual FOAs. Finally, the individual institutes that are relevant to your field probably have the most detailed information.