STATEN ISLAND, N.Y. — When most people reach retirement age, they tend to take it easy.
But Robert E. Campbell, a Dongan Hills resident, is not like most people.
Instead of putting his feet up, the 92-year-old gets to work, planting and tending to hundreds of flowers each year in one of the most unusual locations: A planter garden at the heart of a busy intersection where Richmond Road splits off to Targee Street, near a BP gas station…