Is it easier for an older person to get pressure sores?

Pressure ulcer. As a patient gets older, they are often become more sedentary and the chances of prolonged pressure on bony prominences increases the incidence of pressure sores. This same subset of patients have altered nutrition too which puts them at further risk.
Not just age. Age is a factor in the development of pressure sores because skin and soft tissues tend to thin as we age. However, the most important risk factors for pressure ulcer development are overall mobility/strength (ability to reposition), sensation (ability to feel pain before an ulcer develops) and overall health (ability of the body to repair itself).