Is it safe to use an aged Facebook account someone else owns to run my ads?

No — and this is one of the highest-risk moves in the Meta advertising ecosystem. Using someone else's account to run your ads violates Meta's Terms of Service and carries significant consequences if detected.

• What "aged account" sellers claim: That an established personal profile with a long history and no prior violations runs ads with lower scrutiny. This is partially true — established profiles do face slightly less initial friction. But the risk premium is enormous.
• What actually happens when caught: Meta's systems detect mismatches between the account owner's identity and the actual user. Both the aged account AND your Business Manager can be permanently disabled. The aged account owner can also face legal liability for facilitating this.
• The right approach: Use your own legitimate Facebook profile. Keep it in good standing by not engaging in policy-violating behavior on the personal account. The "old account is safer" belief is true at the margins — but your own clean profile is safer than a bought account you can't control.
• If you can't use your own profile: A business partner's legitimate profile, or a trusted family member's profile with their full knowledge and consent, is the appropriate route for a second Business Manager.