Is is still possible to Potty Train a 5 year old Dog?

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We just moved to a new house and our Dog started pooping and peeing at the main entrance of the gate. We became so busy with the past months so we aren't able to train him well to at least do those stuff on the backyard where it wont be visible from the outside street. It's kinda hassle because our gate's design are grills at the bottom so it's really a mess to see it from the outside. It's embarrassing to our neighbors as well. We only got to clean it in the morning before going to work and when we get back late at night, there are new piles of poop again.