He points out that the path of life is continuous: everyone moves from infancy and childhood, to youth and middle age. Smoothly passing through any period of life helps make getting through the next period easier.
政大心理學系教授李良哲從「發展心理學」的角度詮釋中年，他指出，生命歷程是連續的，從嬰幼兒、青少年、壯年到中年，每一個階段若能走得穩，自然有助於順利過渡到下一個階段。