BRATTLEBORO - Vermont is aging. The state faces declining school populations, a dwindling pool of volunteers who keep communities running, and a labor shortage affecting everything from health care to trucking. As part of a new statewide network to attract and retain new or returning Vermont residents, Brattleboro Development Credit Corporation is participating in Think Vermont’s GROW Grants for Relocation Outreach Work program, funded by the Legislature as part of the Department of Tourism and Marketing’s annual budget.