Is that a recent picture? If so, he certainly is a youthful looking 85!
Has there been any ATM or card activity? Cell phone?
It's not uncommon for people of this age to become confused and think it's time to "go to work" and get lost while driving. I would also ask those close to him where his favorite retreat/meditation places are. Although I imagine by now that has already been explored.
Holding this man in special prayer.
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