This Notice informs that NIA intends to publish a Notice of Funding Opportunity (NOFO) inviting applications from mid-career investigators for mentored career enhancement awards focused on cross-disciplinary training to broaden and strengthen the investigator's capability to lead future comparative studies of the factors contributing to differences in life spans between human and nonhuman primate species. The NOFO is intended to provide support for experienced investigators with expertise in human and/or nonhuman primate (NHP) studies to do the following: 1) Augment or redirect their research program by acquiring expertise in other fields related to comparative primate research and aging 2) Develop collaborations with research fields with which they do not commonly interact This Notice is being provided to allow potential applicants sufficient time to identify potential mentors and prepare well-developed career enhancement plans. The NOFO is expected to be published in June 2024 with an anticipated application due date in November 2024. These are estimated time frames, and they may change. The NOFO is expected to utilize the K18 Career Enhancement Award activity code. It is expected that the NOFO will not allow clinical trials. Additional details of the planned NOFO are provided below.