Changes in brain structure and function are a normal part of the aging process from middle age through older adulthood. In the last decade, an explosion of work has focused on brain structure in disorders that occur as we age. Yet, relatively few studies have focused on healthy aging of brain circuitry and how it varies across people.
Thanks to recent technological advances pioneered by the Human Connectome Project study of healthy young adults, we can now explore how the brain typically ages and how connections change in mature and older adults. Data collected will be shared broadly so that researchers can learn as much as possible from it for years to come. Characterizing brain aging in healthy adults will also allow us to better understand differences in people with conditions that may affect brain wiring such as dementia or major depression.
The HCP-A Study and the Vulnerability and Resiliency in the Aging Adult Brain Connectome (AABC) extension of HCA aims to collect information that we, our families, and health professionals can use to enhance our well being as we age.
The Lifespan Human Connectome Project Aging (HCP-A) Study enrolled 1,500+ healthy adults ages 36-100+ to discover how individual experiences affect the ways in which different parts of the brain are connected and how these connections (the “connectome”) change across healthy adulthood. To learn how to participate, go to our Recruitment Page.
AABC Release 2 includes cross-sectional (V1) and longitudinal (V2, V3, V4) 3T MR scans and non-imaging phenotypic data from 1396 typically aging adults (ages 36-90+) in the HCP-Aging (HCA) and Aging Adult Brain Connectome (AABC) projects adding 632 sessions bringing the total to 2878 -- 1396 V1, 915 V2, 471 V3, and 96 V4 sessions.
It includes imaging for all included modalities from 1390 participants in 2789 sessions (42+ TB of data total) and non-imaging data collected over a broad range of domains at imaging and non-imaging events. See subject breakdowns for visit counts and event sequence.
What’s new in AABC Release 2?
Preprocessed and unprocessed structural MRI, resting state fMRI, task fMRI, diffusion MRI, ASL, and high-res hippocampal T2 [unprocessed only] data in modality-specific "HCP package" datasets downloadable from BALSA.
Most users should access Preprocessed Recommended fMRI data that have been cleaned of spatially and temporally specific structured noise and precisely aligned across subjects by multimodal cortical surface registration (MSMAll) using HCP pipelines that have been developed specifically for HCP-style data.
Core Variables, high interest primary variables and summary scores, can be viewed and filtered in the BALSA UI
includes MRS brain metabolites and per subject completeness of all datatypes
use Column Selector to add, Export CSV to download all Core Variables or selected subset).
>3,000 Extended (XL) variables and accompanying Data Dictionary, including item-level and follow up event variables, for all participant events available in comprehensive spreadsheets.
Get Access and Download the data: Get started by Registering for BALSA, click on the “ConnectomeDB” tab, and agree to the AABC Data Use Terms. An academic, non-profit, or government email address is required to agree to the AABC Data Use Terms and access the data.
To download imaging data, you must 1) install Aspera Connect (scroll down to “IBM Aspera client-deployed software” to find Aspera Connect download links) and 2) an Aspera Connect plugin for your browser (available from Firefox, Chrome, Safari, etc.).
Set Preferences>Transfers in Aspera Connect to a directory with sufficient space for large downloads.
Use the Column Selector and Export CSV to view, filter on, and download all or subsets of Core Variables for selected subjects.
To download the full non-imaging data, click the Files tab and Download under AABC_Release2_Non-imaging_Data-XL.csv.
Want more information? Check out our updated documentation to help with understanding the file structure and interpreting the data.
Join the Community. If you are actively using HCP data and tools, we encourage you to join and be active in the HCP-Users Google group, so that you can tune in to technical discussions on issues that may be of interest. Once you have joined (posts from nonmembers are moderated to control spam), post questions to hcp-users@humanconnectome.org.
Share your Analyses. As you work with AABC data and prepare your work for publication, we encourage you to use Connectome Workbench to prepare your figures as scenes and upload your scenes as a BALSA dataset that can be linked from your publication. Don’t forget to cite the HCA and AABC grants and BALSA in your manuscript!
View Data Release Documentation
Release Date: Jan 28, 2026
AABC Release 1 includes cross-sectional (V1) and longitudinal (V2, V3) 3T MR scans and non-imaging data from 1248 healthy older adults (ages 36-90+) in the HCP-Aging (HCA) and Aging Adult Brain Connectome (AABC) projects.
It includes multi-modal preprocessed and unprocessed imaging data (structural, high-res hippocampal T2 [unprocessed only], resting state fMRI, task fMRI, diffusion, and ASL) on 1248 participants in 2214 imaging visits (many subjects have data for more than one visit, 36+ TB of data). It includes non-imaging data collected over a broad range of domains for 1248 V1, 762 V2, and 236 V3 (2246 total) in-person visits and in remote follow up surveys (non-imaging events). Session breakdowns by study and visit/event are available here.
What’s new in AABC Release 1?
Get Access and Download the data: Get started by Registering for BALSA and agreeing to the AABC Data Use Terms. An academic, non-profit, or government email address is required for agreement to the AABC Data Use Terms and accessing the data.
To download imaging data, you must 1) install Aspera Connect (scroll down to “IBM Aspera client-deployed software” to find Aspera Connect download links) and 2) an Aspera Connect plugin for your browser (available from Firefox, Chrome, Safari, etc.).
Set Preferences>Transfers in Aspera Connect to a directory with sufficient space for large downloads.
To download the full non-imaging data, click the Files tab and Download under AABC_Release1_Non-imaging_Data-XL.csv. Use the Column Selector and Export CSV to view, filter on, and download all or subsets of Core Variables for selected subjects.
Want more information? Check out our updated documentation to help with understanding the file structure and interpreting the data.
View Data Release Documentation
Release Date: Oct 27, 2025
Lifespan HCP Release 2.0 includes cross-sectional visit 1 (V1) preprocessed structural and functional imaging data, unprocessed V1 imaging data for all included modalities (structural, high-res hippocampal T2, resting state fMRI, task fMRI, diffusion, and ASL), and non-imaging demographic and behavioral assessment data from 725 HCP-Aging (HCP-A, ages 36-100+) healthy participants (22+ TB of data).
What’s new in the Lifespan 2.0 release?
Get Access and Download the data: Get started with the Data Access and Download Instructions for navigating NDA and using it's download tools. We've also created a wiki that details setup for downloading data via NDA's command line tools.
Want more information? Check out our updated documentation to help with understanding the file structure and interpreting the data.
View Data Release Documentation
Release Date: Feb 26, 2021