Both the blood and lymphatic vessels form vascular system which is important in the processes of aging. These systems offer appropriate niches and cues for stem cells to operate and repair tissues. However due to the aging process the vascular system may not be able to perform its functions effectively which would result in the reduction of stem cells activity and increase of aging-associated diseases. On the other hand studies indicate that if the vascular system is kept fit it can postpone the aging process and help to grow older by aiding the rejuvenation of stem cells.